{"id":65477,"date":"2024-03-31T11:15:42","date_gmt":"2024-03-31T04:15:42","guid":{"rendered":"https:\/\/itviec.com\/blog\/?p=65477"},"modified":"2024-04-12T14:00:32","modified_gmt":"2024-04-12T07:00:32","slug":"css-la-gi","status":"publish","type":"post","link":"https:\/\/itviec.com\/blog\/css-la-gi\/","title":{"rendered":"CSS l\u00e0 g\u00ec? H\u01b0\u1edbng d\u1eabn s\u1eed d\u1ee5ng hi\u1ec7u qu\u1ea3 CSS \u0111\u1ec3 thi\u1ebft k\u1ebf web"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed9i dung b\u00e0i vi\u1ebft<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/itviec.com\/blog\/css-la-gi\/#CSS_la_gi\" >CSS l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/itviec.com\/blog\/css-la-gi\/#CSS_hoat_dong_the_nao\" >CSS ho\u1ea1t \u0111\u1ed9ng th\u1ebf n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/itviec.com\/blog\/css-la-gi\/#Vai_tro_cua_CSS_trong_thiet_ke_website\" >Vai tr\u00f2 c\u1ee7a CSS trong thi\u1ebft k\u1ebf website<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/itviec.com\/blog\/css-la-gi\/#Cau_truc_co_ban_cua_cu_phap_CSS\" >C\u1ea5u tr\u00fac c\u01a1 b\u1ea3n c\u1ee7a c\u00fa ph\u00e1p CSS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/itviec.com\/blog\/css-la-gi\/#Cac_thao_tac_thiet_ke_giao_dien_web_bang_CSS_co_ban\" >C\u00e1c thao t\u00e1c thi\u1ebft k\u1ebf giao di\u1ec7n web b\u1eb1ng CSS c\u01a1 b\u1ea3n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/itviec.com\/blog\/css-la-gi\/#3_cach_nhung_CSS_vao_website\" >3 c\u00e1ch nh\u00fang CSS v\u00e0o website<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/itviec.com\/blog\/css-la-gi\/#Cac_cau_hoi_ve_CSS_la_gi_thuong_gap\" >C\u00e1c c\u00e2u h\u1ecfi v\u1ec1 CSS l\u00e0 g\u00ec th\u01b0\u1eddng g\u1eb7p<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/itviec.com\/blog\/css-la-gi\/#Tong_ket_ve_CSS_la_gi\" >T\u1ed5ng k\u1ebft v\u1ec1 CSS l\u00e0 g\u00ec<\/a><\/li><\/ul><\/nav><\/div>\n<p><em><strong>CSS c\u00f9ng v\u1edbi HTML v\u00e0 JavaScript l\u00e0 ba c\u00f4ng ngh\u1ec7 c\u1ed1t l\u00f5i \u0111\u1ed1i v\u1edbi m\u1ed9t Web Developer. N\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c v\u00e0 s\u1eed d\u1ee5ng th\u00e0nh th\u1ea1o CSS gi\u00fap b\u1ea1n t\u1ea1o ra c\u00e1c website \u0111\u1eb9p m\u1eaft, d\u1ec5 s\u1eed d\u1ee5ng, c\u00f3 kh\u1ea3 n\u0103ng truy c\u1eadp cao v\u00e0 hi\u1ec7u su\u1ea5t t\u1ed1t. N\u1ebfu b\u1ea1n \u0111ang t\u00ecm hi\u1ec3u CSS l\u00e0 g\u00ec v\u00e0 c\u00e1ch s\u1eed d\u1ee5ng CSS \u0111\u1ec3 thi\u1ebft k\u1ebf website \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c c\u00e1c y\u1ebfu t\u1ed1 tr\u00ean, \u0111\u00e2y ch\u00ednh l\u00e0 b\u00e0i vi\u1ebft d\u00e0nh cho b\u1ea1n.<\/strong><\/em><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1ecdc b\u00e0i vi\u1ebft n\u00e0y \u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">CSS l\u00e0 g\u00ec?\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e1ch ho\u1ea1t \u0111\u1ed9ng v\u00e0 vai tr\u00f2 c\u1ee7a CSS\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u1ea5u tr\u00fac c\u01a1 b\u1ea3n c\u1ee7a c\u00fa ph\u00e1p CSS<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e1c thao t\u00e1c thi\u1ebft k\u1ebf web v\u1edbi CSS<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">3 c\u00e1ch nh\u00fang CSS v\u00e0o trang web<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 CSS<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"CSS_la_gi\"><\/span><b>CSS l\u00e0 g\u00ec?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">CSS (vi\u1ebft t\u1eaft c\u1ee7a Cascading Style Sheets) l\u00e0 ng\u00f4n ng\u1eef style sheets, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 m\u00f4 t\u1ea3 c\u00e1ch tr\u00ecnh b\u00e0y c\u00e1c t\u00e0i li\u1ec7u \u0111\u01b0\u1ee3c vi\u1ebft b\u1eb1ng ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u (HTML, XML, SVG). CSS gi\u00fap ki\u1ec3m so\u00e1t c\u00e1ch tr\u00ecnh b\u00e0y c\u1ee7a c\u00e1c y\u1ebfu t\u1ed1 HTML g\u1ed3m:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">M\u00e0u s\u1eafc: M\u00e0u n\u1ec1n, m\u00e0u ch\u1eef, m\u00e0u vi\u1ec1n,&#8230;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ph\u00f4ng ch\u1eef: Ki\u1ec3u ch\u1eef, k\u00edch th\u01b0\u1edbc ch\u1eef, \u0111\u1ed9 d\u00e0y ch\u1eef,&#8230;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u1ed1 c\u1ee5c: V\u1ecb tr\u00ed c\u00e1c y\u1ebfu t\u1ed1, k\u00edch th\u01b0\u1edbc, c\u0103n ch\u1ec9nh,&#8230;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hi\u1ec7u \u1ee9ng: Hi\u1ec7u \u1ee9ng chuy\u1ec3n ti\u1ebfp, hi\u1ec7u \u1ee9ng di chu\u1ed9t,&#8230;<\/span><\/li>\n<\/ul>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/html-la-gi\/\" target=\"_blank\" rel=\"noopener\"><strong>Gi\u1ea3i \u0111\u00e1p \u201ct\u1ea5t t\u1ea7n t\u1eadt\u201d nh\u1eefng \u0111i\u1ec1u c\u1ea7n bi\u1ebft v\u1ec1 HTML<\/strong><\/a><\/em><\/p><\/blockquote>\n<h2><span class=\"ez-toc-section\" id=\"CSS_hoat_dong_the_nao\"><\/span><b> CSS ho\u1ea1t \u0111\u1ed9ng th\u1ebf n\u00e0o?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">M\u1ed7i tr\u00ecnh duy\u1ec7t s\u1ebd c\u00f3 c\u00e1c b\u01b0\u1edbc x\u1eed l\u00fd qu\u00e1 tr\u00ecnh t\u1ea3i trang web kh\u00e1c nhau. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng giai \u0111o\u1ea1n chung:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ea3i HTML<\/b><span style=\"font-weight: 400;\">: Tr\u00ecnh duy\u1ec7t t\u1ea3i trang HTML t\u1eeb m\u00e1y ch\u1ee7 web.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ea1o DOM: <\/b><span style=\"font-weight: 400;\">Tr\u00ecnh duy\u1ec7t chuy\u1ec3n \u0111\u1ed5i HTML th\u00e0nh DOM (Document Object Model). \u0110\u00e2y l\u00e0 m\u1ed9t m\u00f4 h\u00ecnh c\u00e2y th\u1ec3 hi\u1ec7n c\u1ea5u tr\u00fac c\u1ee7a trang web.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ea3i t\u00e0i nguy\u00ean<\/b><span style=\"font-weight: 400;\">: Song song v\u1edbi qu\u00e1 tr\u00ecnh t\u1ea1o DOM, tr\u00ecnh duy\u1ec7t c\u0169ng t\u00ecm ki\u1ebfm v\u00e0 t\u1ea3i c\u00e1c file CSS, JavaScript, h\u00ecnh \u1ea3nh, c\u00e1c video v\u00e0 m\u1ed9t s\u1ed1 t\u00e0i nguy\u00ean c\u00f3 li\u00ean quan \u0111\u1ebfn trang web.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Qu\u00e1 tr\u00ecnh t\u1ea1o CSSOM:<\/b><span style=\"font-weight: 400;\"> Tr\u00ecnh duy\u1ec7t s\u1ebd ph\u00e2n t\u00edch n\u1ed9i dung CSS v\u00e0 t\u1ea1o ra CSSOM (CSS Object Model), m\u1ed9t c\u1ea5u tr\u00fac t\u01b0\u01a1ng t\u1ef1 nh\u01b0 DOM nh\u01b0ng d\u00e0nh cho CSS, bao g\u1ed3m c\u00e1c th\u00f4ng tin v\u1ec1 m\u00e0u s\u1eafc, k\u00edch th\u01b0\u1edbc v\u00e0 v\u1ecb tr\u00ed element. D\u1ef1a tr\u00ean c\u00e1c b\u1ed9 ch\u1ecdn t\u00ecm th\u1ea5y, n\u00f3 x\u00e1c \u0111\u1ecbnh quy t\u1eafc n\u00e0o n\u00ean \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho c\u00e1c n\u00fat n\u00e0o trong DOM v\u00e0 \u0111\u00ednh k\u00e8m ki\u1ec3u cho ch\u00fang theo y\u00eau c\u1ea7u (b\u01b0\u1edbc trung gian n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u00e2y render).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u00c1p d\u1ee5ng ki\u1ec3u: <\/b><span style=\"font-weight: 400;\">Tr\u00ecnh duy\u1ec7t \u00e1p d\u1ee5ng c\u00e1c ki\u1ec3u CSS cho c\u00e1c ph\u1ea7n t\u1eed HTML t\u01b0\u01a1ng \u1ee9ng d\u1ef1a tr\u00ean c\u00e1c quy t\u1eafc ch\u1ecdn trong b\u1ea3ng ki\u1ec3u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Hi\u1ec3n th\u1ecb trang web<\/b><span style=\"font-weight: 400;\">: Tr\u00ecnh duy\u1ec7t hi\u1ec3n th\u1ecb trang web tr\u00ean m\u00e0n h\u00ecnh d\u1ef1a tr\u00ean c\u00e1c ki\u1ec3u \u0111\u00e3 \u00e1p d\u1ee5ng (giai \u0111o\u1ea1n n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 painting).<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5 d\u00f9ng CSS \u0111\u1ec3 \u0111\u1ecbnh m\u00e0u s\u1eafc v\u00e0 size ch\u1eef:<\/span><\/p>\n<pre>&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n\r\n&lt;head&gt;\r\n&lt;title&gt;Blog ITviec&lt;\/title&gt;\r\n&lt;style&gt;\r\n\r\n<strong>h1 {<\/strong>\r\n<strong> \u00a0color: red;<\/strong>\r\n<strong> \u00a0font-size: 24px;<\/strong>\r\n<strong>}<\/strong>\r\n\r\n<strong>p {<\/strong>\r\n<strong> \u00a0color: blue;<\/strong>\r\n<strong> \u00a0font-size: 16px;<\/strong>\r\n<strong>}<\/strong>\r\n\r\n&lt;\/style&gt;\r\n&lt;\/head&gt;\r\n\r\n&lt;body&gt;\r\n&lt;h1&gt;Blog ITviec&lt;\/h1&gt;\r\n&lt;p&gt;Ch\u00e0o m\u1eebng b\u1ea1n \u0111\u1ebfn v\u1edbi Blog ITviec&lt;\/p&gt;\r\n&lt;\/body&gt;\r\n\r\n&lt;\/html&gt;<\/pre>\n<p>K\u1ebft qu\u1ea3 hi\u1ec3n th\u1ecb tr\u00ean trang web:<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-65498 size-full\" src=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-3-vippro.png\" alt=\"css l\u00e0 g\u00ec - c\u00e1ch s\u1eed d\u1ee5ng css \u0111\u1ec3 thi\u1ebft k\u1ebf web - itviec blog\" width=\"598\" height=\"278\" srcset=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-3-vippro.png 598w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-3-vippro-300x139.png 300w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-3-vippro-200x93.png 200w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-3-vippro-100x46.png 100w\" sizes=\"auto, (max-width: 598px) 100vw, 598px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Vai_tro_cua_CSS_trong_thiet_ke_website\"><\/span><b>Vai tr\u00f2 c\u1ee7a CSS trong thi\u1ebft k\u1ebf website<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">CSS \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c x\u00e2y d\u1ef1ng v\u00e0 thi\u1ebft k\u1ebf website hay \u1ee9ng d\u1ee5ng. C\u00f3 3 c\u00e1ch th\u00eam CSS v\u00e0o trang web HTML l\u00e0 Inline CSS (CSS n\u1ed9i tuy\u1ebfn), Internal CSS (CSS n\u1ed9i b\u1ed9) v\u00e0 External CSS (CSS b\u00ean ngo\u00e0i). Khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u00fang c\u00e1ch, CSS s\u1ebd mang \u0111\u1ebfn h\u00e0ng lo\u1ea1t l\u1ee3i \u00edch trong vi\u1ec7c ph\u00e1t tri\u1ec3n v\u00e0 duy tr\u00ec website.<\/span><\/p>\n<ul>\n<li><b> \u0110\u1ecbnh d\u1ea1ng v\u00e0 t\u1ea1o ki\u1ec3u cho website:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">CSS cho ph\u00e9p ki\u1ec3m so\u00e1t c\u00e1ch tr\u00ecnh b\u00e0y c\u00e1c y\u1ebfu t\u1ed1 HTML g\u1ed3m m\u00e0u s\u1eafc, ph\u00f4ng ch\u1eef, b\u1ed1 c\u1ee5c, hi\u1ec7u \u1ee9ng,&#8230; Trang web n\u1ebfu kh\u00f4ng c\u00f3 CSS c\u00f3 th\u1ec3 s\u1ebd r\u1ea5t nh\u00e0m ch\u00e1n, kh\u00f3 \u0111\u1ecdc, kh\u00f3 truy c\u1eadp v\u00e0 kh\u00f4ng hi\u1ec7u qu\u1ea3. N\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c v\u00e0 s\u1eed d\u1ee5ng th\u00e0nh th\u1ea1o CSS gi\u00fap Front end Developer t\u1ea1o ra c\u00e1c website \u0111\u1eb9p m\u1eaft, thu h\u00fat v\u00e0 d\u1ec5 s\u1eed d\u1ee5ng.<\/span><\/p>\n<p><em><strong>V\u00ed d\u1ee5 khi ch\u01b0a th\u00eam CSS:<\/strong><\/em><\/p>\n<pre>&lt;!DOCTYPE html&gt;\u00a0\r\n&lt;html&gt;\u00a0\r\n\r\n&lt;head&gt;\u00a0\r\n&lt;title&gt;Blog ITviec&lt;\/title&gt;\r\n&lt;\/head&gt;\u00a0\r\n\r\n&lt;body&gt;\u00a0\r\n&lt;main&gt;\u00a0\r\n&lt;h1&gt;ITviec l\u00e0 g\u00ec?&lt;\/h1&gt;\u00a0\r\n&lt;p&gt;ITviec l\u00e0 trang web t\u00ecm ki\u1ebfm vi\u1ec7c l\u00e0m chuy\u00ean bi\u1ec7t cho ng\u00e0nh IT&lt;\/p&gt;\u00a0\u00a0\r\n&lt;\/main&gt;\u00a0\r\n&lt;\/body&gt;\u00a0\r\n\r\n&lt;\/html&gt;<\/pre>\n<p>Hi\u1ec3n th\u1ecb tr\u00ean trang web s\u1ebd tr\u00f4ng nh\u01b0 th\u1ebf n\u00e0y:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-65489 size-full\" src=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-2-vippro.png\" alt=\"css l\u00e0 g\u00ec - c\u00e1ch s\u1eed d\u1ee5ng css \u0111\u1ec3 thi\u1ebft k\u1ebf web - itviec blog\" width=\"1344\" height=\"346\" srcset=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-2-vippro.png 1344w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-2-vippro-300x77.png 300w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-2-vippro-700x180.png 640w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-2-vippro-200x51.png 200w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-2-vippro-100x26.png 100w\" sizes=\"auto, (max-width: 1344px) 100vw, 1344px\" \/><\/p>\n<p><em><strong>Khi \u0111\u00e3 th\u00eam CSS:<\/strong><\/em><\/p>\n<pre>&lt;!DOCTYPE html&gt;\u00a0\r\n&lt;html&gt;\u00a0\r\n\r\n&lt;head&gt;\u00a0\r\n&lt;title&gt;Blog ITviec&lt;\/title&gt;\u00a0\r\n&lt;style&gt;\u00a0\r\nmain {\u00a0\r\nwidth: 600px;\u00a0\r\nheight: 200px;\u00a0\r\npadding: 10px;\u00a0\r\nbackground: beige;\u00a0\r\n}\u00a0\r\n\r\nh1 {\u00a0\r\ncolor: olivedrab;\u00a0\r\nborder-bottom: 1px dotted darkgreen;\u00a0\r\n}\u00a0\r\n\r\np {\u00a0\r\nfont-family: sans-serif;\u00a0\r\ncolor: orange;\u00a0\r\n}\u00a0\r\n\r\n&lt;\/style&gt;\u00a0\r\n&lt;\/head&gt;\u00a0\r\n\r\n&lt;body&gt;\u00a0\r\n&lt;main&gt;\u00a0\r\n&lt;h1&gt;ITviec l\u00e0 g\u00ec?&lt;\/h1&gt;\u00a0\r\n&lt;p&gt;ITviec l\u00e0 trang web t\u00ecm ki\u1ebfm vi\u1ec7c l\u00e0m chuy\u00ean bi\u1ec7t cho ng\u00e0nh IT&lt;\/p&gt;\u00a0\r\n&lt;\/main&gt;\r\n&lt;\/body&gt;\u00a0\r\n\r\n&lt;\/html&gt;<\/pre>\n<p><span style=\"font-weight: 400;\">Hi\u1ec3n th\u1ecb tr\u00ean trang web l\u00fac n\u00e0y s\u1ebd nh\u01b0 h\u00ecnh b\u00ean d\u01b0\u1edbi:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-65490 size-full\" src=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-vippro.png\" alt=\"css l\u00e0 g\u00ec - c\u00e1ch s\u1eed d\u1ee5ng css \u0111\u1ec3 thi\u1ebft k\u1ebf web - itviec blog\" width=\"1270\" height=\"482\" srcset=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-vippro.png 1270w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-vippro-300x114.png 300w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-vippro-700x266.png 640w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-vippro-200x76.png 200w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/css-example-vippro-100x38.png 100w\" sizes=\"auto, (max-width: 1270px) 100vw, 1270px\" \/><\/p>\n<ul>\n<li><b>T\u00e1ch bi\u1ec7t n\u1ed9i dung v\u00e0 \u0111\u1ecbnh d\u1ea1ng:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Khi s\u1eed d\u1ee5ng CSS n\u1ed9i b\u1ed9 ho\u1eb7c CSS b\u00ean ngo\u00e0i, t\u1ec7p n\u1ed9i dung (HTML) v\u00e0 \u0111\u1ecbnh d\u1ea1ng (CSS) c\u1ee7a website \u0111\u01b0\u1ee3c t\u00e1ch bi\u1ec7t. Nh\u1edd v\u1eady, Front end Developer c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng thay \u0111\u1ed5i giao di\u1ec7n website m\u00e0 kh\u00f4ng l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn n\u1ed9i dung.\u00a0<\/span><\/p>\n<ul>\n<li><b> T\u0103ng kh\u1ea3 n\u0103ng truy c\u1eadp:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">CSS c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng truy c\u1eadp c\u1ee7a website cho ng\u01b0\u1eddi d\u00f9ng khi\u1ebfm khuy\u1ebft b\u1eb1ng c\u00e1ch t\u1ea1o ra c\u00e1c thi\u1ebft k\u1ebf d\u1ec5 ti\u1ebfp c\u1eadn h\u01a1n, ch\u1eb3ng h\u1ea1n t\u0103ng k\u00edch th\u01b0\u1edbc ch\u1eef ho\u1eb7c thay \u0111\u1ed5i \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n c\u1ee7a m\u00e0u s\u1eafc.<\/span><\/p>\n<ul>\n<li><b> T\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t website:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Vi\u1ec7c s\u1eed d\u1ee5ng CSS \u0111\u00fang c\u00e1ch gi\u00fap t\u00e1ch bi\u1ec7t ph\u1ea7n \u0111\u1ecbnh d\u1ea1ng ra kh\u1ecfi n\u1ed9i dung HTML gi\u00fap t\u1eadp tin HTML gi\u1ea3m \u0111\u01b0\u1ee3c k\u00edch th\u01b0\u1edbc. CSS c\u0169ng h\u1ed7 tr\u1ee3 lazy loading gi\u00fap t\u0103ng t\u1ed1c \u0111\u1ed9 t\u1ea3i trang web.<\/span><\/p>\n<ul>\n<li><b> T\u0103ng kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng CSS b\u00ean ngo\u00e0i gi\u00fap vi\u1ec7c b\u1ea3o tr\u00ec trang web nhanh ch\u00f3ng v\u00e0 thu\u1eadn ti\u1ec7n h\u01a1n. \u0110i\u1ec1u n\u00e0y l\u00e0 b\u1edfi t\u1ed5 ch\u1ee9c file CSS \u0111\u01b0\u1ee3c t\u00e1ch ri\u00eang bi\u1ec7t v\u1edbi HTML. Khi c\u1ea7n \u0111i\u1ec1u ch\u1ec9nh giao di\u1ec7n website, c\u00e1c l\u1eadp tr\u00ecnh vi\u00ean ch\u1ec9 c\u1ea7n thay \u0111\u1ed5i t\u1eadp tin CSS m\u00e0 kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i m\u00e3 HTML.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cau_truc_co_ban_cua_cu_phap_CSS\"><\/span><b> C\u1ea5u tr\u00fac c\u01a1 b\u1ea3n c\u1ee7a c\u00fa ph\u00e1p CSS<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><strong>C\u00e1c thu\u1eadt ng\u1eef c\u01a1 b\u1ea3n c\u1ee7a CSS l\u00e0 g\u00ec?<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">To\u00e0n b\u1ed9 c\u1ea5u tr\u00fac c\u1ee7a CSS \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u1ed9t b\u1ed9 quy t\u1eafc v\u1edbi 2 ph\u1ea7n ch\u00ednh g\u1ed3m: <strong>B\u1ed9 ch\u1ecdn (selector), Kh\u1ed1i khai b\u00e1o (Declaration Blocks)<\/strong>.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>B\u1ed9 ch\u1ecdn<\/strong> gi\u00fap x\u00e1c \u0111\u1ecbnh ph\u1ea7n t\u1eed HTML c\u1ea7n mu\u1ed1n \u0111\u1ecbnh d\u1ea1ng. C\u00f3 nhi\u1ec1u lo\u1ea1i b\u1ed9 ch\u1ecdn kh\u00e1c nhau g\u1ed3m: B\u1ed9 ch\u1ecdn theo th\u1ebb (element selector), B\u1ed9 ch\u1ecdn theo class (class selector), B\u1ed9 ch\u1ecdn theo ID (id selector), B\u1ed9 ch\u1ecdn con ch\u00e1u (descendant selector), B\u1ed9 ch\u1ecdn anh em (sibling selector).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>Khai b\u00e1o<\/strong> gi\u00fap x\u00e1c \u0111\u1ecbnh thu\u1ed9c t\u00ednh (property) v\u00e0 gi\u00e1 tr\u1ecb (value) c\u1ee7a thu\u1ed9c t\u00ednh \u0111\u00f3 \u0111\u1ec3 \u0111\u1ecbnh d\u1ea1ng cho ph\u1ea7n t\u1eed \u0111\u01b0\u1ee3c ch\u1ecdn. C\u00e1c khai b\u00e1o th\u01b0\u1eddng \u0111\u01b0\u1ee3c ng\u0103n c\u00e1ch v\u1edbi nhau b\u1edfi d\u1ea5u \u201c;\u201d. Kh\u1ed1i bao g\u1ed3m m\u1ed9t ho\u1eb7c nhi\u1ec1u khai b\u00e1o \u0111\u01b0\u1ee3c \u0111\u1eb7t trong ngo\u1eb7c nh\u1ecdn {}.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5: B\u1ea1n mu\u1ed1n t\u1ea1o giao di\u1ec7n cho m\u1ed9t trang web \u0111\u01a1n gi\u1ea3n v\u1edbi c\u00e1c th\u00e0nh ph\u1ea7n sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ti\u00eau \u0111\u1ec1 trang web: H1 c\u00f3 m\u00e0u \u0111\u1ecf, font size 24px.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">N\u00fat &#8220;Li\u00ean h\u1ec7&#8221;: Button c\u00f3 m\u00e0u xanh d\u01b0\u01a1ng, ch\u1eef tr\u1eafng, padding 10px 20px, bo tr\u00f2n 5px.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">N\u1ed9i dung trang web: Paragraph c\u00f3 m\u00e0u \u0111en, font size 16px.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">\u0110o\u1ea1n code CSS sau \u0111\u00e2y s\u1eed d\u1ee5ng b\u1ed9 ch\u1ecdn class \u0111\u1ec3 \u0111\u1ecbnh d\u1ea1ng c\u00e1c th\u00e0nh ph\u1ea7n tr\u00ean:<\/span><\/p>\n<pre>\/* style.css *\/\r\n\r\n\/* \u0110\u1ecbnh d\u1ea1ng ti\u00eau \u0111\u1ec1 trang web *\/\r\n\r\n.tieu-de {\r\n\r\n\u00a0\u00a0color: red;\r\n\u00a0\u00a0font-size: 24px;\r\n\r\n}\r\n\r\n\/* \u0110\u1ecbnh d\u1ea1ng n\u00fat \"Li\u00ean h\u1ec7\" *\/\r\n\r\n.btn-lien-he {\r\n\r\n\u00a0\u00a0background-color: #007bff;\r\n\u00a0\u00a0color: #fff;\r\n\u00a0\u00a0padding: 10px 20px;\r\n\u00a0\u00a0border: none;\r\n\u00a0\u00a0border-radius: 5px;\r\n\r\n}\r\n\r\n\/* \u0110\u1ecbnh d\u1ea1ng n\u1ed9i dung trang web *\/\r\n\r\n.noi-dung {\r\n\r\n\u00a0\u00a0color: #333;\r\n\u00a0\u00a0font-size: 16px;\r\n\r\n}<\/pre>\n<h3><b>C\u00e1c thu\u1ed9c t\u00ednh c\u01a1 b\u1ea3n c\u1ee7a CSS<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>M\u00e0u s\u1eafc (Color): <\/b><span style=\"font-weight: 400;\">color (m\u00e0u s\u1eafc v\u0103n b\u1ea3n), background-color (m\u00e0u n\u1ec1n c\u1ee7a ph\u1ea7n t\u1eed), fill (m\u00e0u cho n\u1ed9i dung SVG), stroke (m\u00e0u cho \u0111\u01b0\u1eddng vi\u1ec1n SVG),&#8230;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ph\u00f4ng ch\u1eef (Font): <\/b><span style=\"font-weight: 400;\">font-family (ki\u1ec3u ch\u1eef), font-size (c\u1ee1 ch\u1eef), font-weight (\u0111\u1ed9 d\u00e0y font ch\u1eef), text-decoration (\u0111\u01b0\u1eddng vi\u1ec1n d\u01b0\u1edbi, g\u1ea1ch ngang, ho\u1eb7c b\u00f3ng \u0111\u1ed5 cho v\u0103n b\u1ea3n),&#8230;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u1ed1 c\u1ee5c (Layout)<\/b><span style=\"font-weight: 400;\">: display (ki\u1ec3u hi\u1ec3n th\u1ecb: block, inline, none,&#8230;), position (v\u1ecb tr\u00ed: static, relative, absolute, fixed,&#8230;), margin (l\u1ec1), top (v\u1ecb tr\u00ed tr\u00ean c\u00f9ng), left (v\u1ecb tr\u00ed b\u00ean tr\u00e1i), right (v\u1ecb tr\u00ed b\u00ean ph\u1ea3i), bottom (v\u1ecb tr\u00ed d\u01b0\u1edbi c\u00f9ng),&#8230;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Hi\u1ec7u \u1ee9ng (Effect):<\/b><span style=\"font-weight: 400;\"> transition (hi\u1ec7u \u1ee9ng chuy\u1ec3n ti\u1ebfp cho c\u00e1c thu\u1ed9c t\u00ednh CSS), animation (hi\u1ec7u \u1ee9ng ho\u1ea1t h\u00ecnh), box-shadow (b\u00f3ng \u0111\u1ed5 cho m\u1ed9t ph\u1ea7n t\u1eed), border-radius (Bo tr\u00f2n g\u00f3c cho m\u1ed9t ph\u1ea7n t\u1eed), filter (\u00e1p d\u1ee5ng b\u1ed9 l\u1ecdc cho m\u1ed9t ph\u1ea7n t\u1eed),&#8230;<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5:<\/span><\/p>\n<pre>h1 {\r\n\r\n\u00a0\u00a0color: red; \/* m\u00e0u ch\u1eef \u0111\u1ecf *\/\r\n\u00a0\u00a0font-size: 24px; \/* k\u00edch th\u01b0\u1edbc ch\u1eef 24px *\/\r\n\r\n}\r\n\r\np {\r\n\r\n\u00a0\u00a0color: blue; \/* m\u00e0u ch\u1eef xanh *\/\r\n\u00a0\u00a0font-size: 16px; \/* k\u00edch th\u01b0\u1edbc ch\u1eef 16px *\/\r\n\r\n}<\/pre>\n<h3><b>C\u00e1c lo\u1ea1i b\u1ed9 ch\u1ecdn trong CSS<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">B\u1ed9 ch\u1ecdn l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong CSS, gi\u00fap b\u1ea1n ch\u1ecdn c\u00e1c ph\u1ea7n t\u1eed HTML c\u1ee5 th\u1ec3 \u0111\u1ec3 \u0111\u1ecbnh d\u1ea1ng. C\u00f3 nhi\u1ec1u lo\u1ea1i B\u1ed9 ch\u1ecdn kh\u00e1c nhau, m\u1ed7i lo\u1ea1i c\u00f3 ch\u1ee9c n\u0103ng ri\u00eang bi\u1ec7t.<\/span><\/p>\n<ul>\n<li><b>C\u00e1c b\u1ed9 ch\u1ecdn c\u01a1 b\u1ea3n<\/b><\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td>\n<p style=\"text-align: left;\"><b>B\u1ed9 ch\u1ecdn<\/b><\/p>\n<\/td>\n<td style=\"text-align: left;\"><b>\u0110\u1eb7c \u0111i\u1ec3m<\/b><\/td>\n<td style=\"text-align: left;\"><b>V\u00ed d\u1ee5<\/b><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><b>B\u1ed9 ch\u1ecdn ph\u1ea7n t\u1eed (c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u1ed9 ch\u1ecdn th\u1ebb ho\u1eb7c lo\u1ea1i)<\/b><\/td>\n<td style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n t\u1eed HTML c\u00f3 c\u00f9ng t\u00ean th\u1ebb.<\/span><\/td>\n<td>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">p<\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn &lt;p&gt;<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p style=\"text-align: left;\"><b>B\u1ed9 ch\u1ecdn ID<\/b><\/p>\n<\/td>\n<td style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn ph\u1ea7n t\u1eed HTML c\u00f3 ID c\u1ee5 th\u1ec3.<\/span><\/td>\n<td style=\"text-align: left;\"><span style=\"font-weight: 400;\">#my-id<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ch\u1ecdn &lt;p id=&#8221;my-id&#8221;&gt;ho\u1eb7c &lt;a id=&#8221;my-id&#8221;&gt;<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><b>B\u1ed9 ch\u1ecdn class<\/b><\/td>\n<td style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn t\u1ea5t c\u1ea3 ph\u1ea7n t\u1eed HTML c\u00f3 c\u00f9ng class.<\/span><\/td>\n<td>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">.my-class<\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn &lt;p class=&#8221;my-class&#8221;&gt;v\u00e0 &lt;a class=&#8221;my-class&#8221;&gt;<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p style=\"text-align: left;\"><b>B\u1ed9 ch\u1ecdn thu\u1ed9c t\u00ednh<\/b><\/p>\n<\/td>\n<td style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn ph\u1ea7n t\u1eed tr\u00ean trang c\u00f3 thu\u1ed9c t\u00ednh \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh.<\/span><\/td>\n<td style=\"text-align: left;\"><span style=\"font-weight: 400;\">img[src]<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ch\u1ecdn &lt;img src=&#8221;myimage.png&#8221;&gt;nh\u01b0ng kh\u00f4ng &lt;img&gt;<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><b>B\u1ed9 ch\u1ecdn l\u1edbp gi\u1ea3 (Pseudo-class)<\/b><\/td>\n<td style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn ph\u1ea7n t\u1eed \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh, nh\u01b0ng ch\u1ec9 khi \u1edf tr\u1ea1ng th\u00e1i \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh.<\/span><\/td>\n<td>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">a:hover<\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">ch\u1ecdn &lt;a&gt;, nh\u01b0ng ch\u1ec9 khi con tr\u1ecf chu\u1ed9t di chu\u1ed9t qua li\u00ean k\u1ebft.<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li><b>C\u00e1c b\u1ed9 ch\u1ecdn n\u00e2ng cao<\/b><\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td>\n<p style=\"text-align: left;\"><b>B\u1ed9 ch\u1ecdn<\/b><\/p>\n<\/td>\n<td style=\"text-align: left;\"><b>\u0110\u1eb7c \u0111i\u1ec3m<\/b><\/td>\n<td style=\"text-align: left;\"><b>V\u00ed d\u1ee5<\/b><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><b>B\u1ed9 ch\u1ecdn con ch\u00e1u (descendant selector)<\/b><\/td>\n<td style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n t\u1eed con ch\u00e1u c\u1ee7a m\u1ed9t ph\u1ea7n t\u1eed \u0111\u01b0\u1ee3c ch\u1ecdn.<\/span><\/td>\n<td>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">div p<\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn t\u1ea5t c\u1ea3 c\u00e1c \u0111o\u1ea1n v\u0103n b\u00ean trong c\u00e1c div.<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p style=\"text-align: left;\"><b>B\u1ed9 ch\u1ecdn anh em (sibling selector)<\/b><\/p>\n<\/td>\n<td style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn ph\u1ea7n t\u1eed li\u1ec1n k\u1ec1 ngay sau ph\u1ea7n t\u1eed \u0111\u01b0\u1ee3c ch\u1ecdn.<\/span><\/td>\n<td style=\"text-align: left;\"><span style=\"font-weight: 400;\">h1 + p<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ch\u1ecdn t\u1ea5t c\u1ea3 c\u00e1c \u0111o\u1ea1n v\u0103n li\u1ec1n k\u1ec1 ngay sau th\u1ebb h1.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><b>B\u1ed9 ch\u1ecdn con (child selector)<\/b><\/td>\n<td style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n t\u1eed con tr\u1ef1c ti\u1ebfp c\u1ee7a ph\u1ea7n t\u1eed \u0111\u01b0\u1ee3c ch\u1ecdn.<\/span><\/td>\n<td>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">ul &gt; li<\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn t\u1ea5t c\u1ea3 m\u1ee5c danh s\u00e1ch (li) tr\u1ef1c ti\u1ebfp b\u00ean trong danh s\u00e1ch kh\u00f4ng th\u1ee9 t\u1ef1 (ul).<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p style=\"text-align: left;\"><b>B\u1ed9 ch\u1ecdn l\u00e2n c\u1eadn (adjacent sibling selector)<\/b><\/p>\n<\/td>\n<td style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn ph\u1ea7n t\u1eed li\u1ec1n k\u1ec1 ngay sau v\u00e0 c\u00f9ng c\u1ea5p v\u1edbi ph\u1ea7n t\u1eed \u0111\u01b0\u1ee3c ch\u1ecdn.<\/span><\/td>\n<td>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">h1 ~ p<\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">Ch\u1ecdn t\u1ea5t c\u1ea3 c\u00e1c \u0111o\u1ea1n v\u0103n li\u1ec1n k\u1ec1 ngay sau th\u1ebb h1 v\u00e0 c\u00f9ng c\u1ea5p v\u1edbi n\u00f3.<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i ra, CSS c\u00f2n c\u00f3 m\u1ed9t s\u1ed1 b\u1ed9 ch\u1ecdn kh\u00e1c nh\u01b0:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Universal selector: Ch\u1ecdn t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n t\u1eed HTML.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pseudo-element selector: Ch\u1ecdn m\u1ed9t ph\u1ea7n c\u1ee5 th\u1ec3 c\u1ee7a ph\u1ea7n t\u1eed HTML (v\u00ed d\u1ee5: ::before, ::after).<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cac_thao_tac_thiet_ke_giao_dien_web_bang_CSS_co_ban\"><\/span><b>C\u00e1c thao t\u00e1c thi\u1ebft k\u1ebf giao di\u1ec7n web b\u1eb1ng CSS c\u01a1 b\u1ea3n<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b> Thay \u0111\u1ed5i m\u00e0u s\u1eafc<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh color \u0111\u1ec3 thay \u0111\u1ed5i m\u00e0u s\u1eafc c\u1ee7a text.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh background-color \u0111\u1ec3 thay \u0111\u1ed5i m\u00e0u n\u1ec1n c\u1ee7a ph\u1ea7n t\u1eed HTML.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh gradient \u0111\u1ec3 t\u1ea1o hi\u1ec7u \u1ee9ng chuy\u1ec3n m\u00e0u cho n\u1ec1n c\u1ee7a ph\u1ea7n t\u1eed HTML.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh filter \u0111\u1ec3 th\u00eam c\u00e1c hi\u1ec7u \u1ee9ng filter cho ph\u1ea7n t\u1eed HTML.<\/span><\/li>\n<\/ul>\n<p><strong><em>V\u00ed d\u1ee5 s\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh background-color \u0111\u1ec3 thay \u0111\u1ed5i m\u00e0u n\u1ec1n c\u1ee7a ph\u1ea7n t\u1eed HTML:<\/em><\/strong><\/p>\n<pre>body {\r\n\r\n\u00a0\u00a0color: #000000;\r\n\u00a0\u00a0background-color: #ffffff;\r\n\r\n}\r\n\r\nh1 {\r\n\r\n\u00a0\u00a0color: #ff0000;\r\n\r\n}\r\n\r\np {\r\n\r\n\u00a0\u00a0background-color: #00ff00;\r\n\r\n}<\/pre>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/bang-mau-html\/\" target=\"_blank\" rel=\"noopener\"><strong>T\u1ed5ng h\u1ee3p chi ti\u1ebft v\u00e0 \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t v\u1ec1 B\u1ea3ng m\u00e0u HTML<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>\u0110\u1ecbnh d\u1ea1ng b\u1ed1 c\u1ee5c<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh margin \u0111\u1ec3 t\u1ea1o kho\u1ea3ng c\u00e1ch gi\u1eefa body v\u00e0 c\u00e1c ph\u1ea7n t\u1eed kh\u00e1c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh padding \u0111\u1ec3 t\u1ea1o kho\u1ea3ng c\u00e1ch gi\u1eefa n\u1ed9i dung body v\u00e0 \u0111\u01b0\u1eddng vi\u1ec1n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh text-align \u0111\u1ec3 c\u0103n l\u1ec1 text sang tr\u00e1i, ph\u1ea3i, gi\u1eefa ho\u1eb7c hai \u0111\u1ea7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng display: flex \u0111\u1ec3 k\u00edch ho\u1ea1t flexbox cho body.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh flexbox nh\u01b0 justify-content v\u00e0 align-items \u0111\u1ec3 c\u0103n ch\u1ec9nh c\u00e1c ph\u1ea7n t\u1eed theo chi\u1ec1u ngang v\u00e0 chi\u1ec1u d\u1ecdc.<\/span><\/li>\n<\/ul>\n<p><strong><em>V\u00ed d\u1ee5 s\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh background-color \u0111\u1ec3 thay \u0111\u1ed5i m\u00e0u n\u1ec1n c\u1ee7a ph\u1ea7n t\u1eed HTML:<\/em><\/strong><\/p>\n<pre>body {\r\n\r\n\u00a0\u00a0width: 600px;\r\n\u00a0\u00a0margin: 0 auto;\r\n\u00a0\u00a0background-color: #ff9500;\r\n\u00a0\u00a0padding: 0 20px 20px 20px;\r\n\u00a0\u00a0border: 5px solid black;\r\n\r\n}<\/pre>\n<h3><b>\u0110\u1ecbnh d\u1ea1ng v\u0103n b\u1ea3n<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh font-family: \u0111\u1ec3 ch\u1ecdn font ch\u1eef cho ph\u1ea7n t\u1eed HTML.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh font-size: \u0111\u1ec3 \u0111\u1ecbnh c\u1ee1 font ch\u1eef.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh font-weight: \u0111\u1ec3 \u0111\u1ecbnh \u0111\u1ed9 d\u00e0y m\u1ecfng c\u1ee7a font ch\u1eef.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh font-style: \u0111\u1ec3 \u0111\u1ecbnh ki\u1ec3u ch\u1eef nh\u01b0 normal, italic, oblique,&#8230;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh text-transform: \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i ki\u1ec3u ch\u1eef nh\u01b0 uppercase, lowercase, capitalize,&#8230;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh letter-spacing: \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c k\u00fd t\u1ef1.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh word-spacing: \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c t\u1eeb.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh text-shadow: \u0111\u1ec3 th\u00eam b\u00f3ng \u0111\u1ed5 cho text.<\/span><\/li>\n<\/ul>\n<h3><b>C\u0103n ch\u1ec9nh h\u00ecnh \u1ea3nh<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh margin: \u0111\u1ec3 t\u1ea1o kho\u1ea3ng c\u00e1ch gi\u1eefa h\u00ecnh \u1ea3nh v\u00e0 c\u00e1c ph\u1ea7n t\u1eed kh\u00e1c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh float: \u0111\u1ec3 di chuy\u1ec3n h\u00ecnh \u1ea3nh sang tr\u00e1i ho\u1eb7c ph\u1ea3i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh text-align: \u0111\u1ec3 c\u0103n ch\u1ec9nh h\u00ecnh \u1ea3nh trong m\u1ed9t ph\u1ea7n t\u1eed block.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng display: flex \u0111\u1ec3 k\u00edch ho\u1ea1t flexbox cho ph\u1ea7n t\u1eed ch\u1ee9a h\u00ecnh \u1ea3nh.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh flexbox nh\u01b0 justify-content v\u00e0 align-items \u0111\u1ec3 c\u0103n ch\u1ec9nh h\u00ecnh \u1ea3nh theo chi\u1ec1u ngang v\u00e0 chi\u1ec1u d\u1ecdc.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng display: grid \u0111\u1ec3 k\u00edch ho\u1ea1t grid layout cho ph\u1ea7n t\u1eed ch\u1ee9a h\u00ecnh \u1ea3nh.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh grid layout nh\u01b0 grid-template-columns v\u00e0 grid-template-rows \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc c\u1ee7a c\u00e1c c\u1ed9t v\u00e0 h\u00e0ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh grid layout nh\u01b0 justify-content v\u00e0 align-items \u0111\u1ec3 c\u0103n ch\u1ec9nh h\u00ecnh \u1ea3nh trong grid.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"3_cach_nhung_CSS_vao_website\"><\/span><b>3 c\u00e1ch nh\u00fang CSS v\u00e0o website<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp, c\u00f3 3 c\u00e1ch ph\u1ed5 bi\u1ebfn \u0111\u1ec3 nh\u00fang CSS v\u00e0o website: <strong>CSS n\u1ed9i tuy\u1ebfn (Inline CSS), CSS n\u1ed9i b\u1ed9 (Internal CSS) v\u00e0 CSS b\u00ean ngo\u00e0i (External CSS).<\/strong> Trong n\u1ed9i dung b\u00ean d\u01b0\u1edbi, ITviec s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 t\u1eebng c\u00e1ch nh\u00fang CSS v\u00e0o website.<\/span><\/p>\n<h3><b>CSS n\u1ed9i tuy\u1ebfn<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">CSS n\u1ed9i tuy\u1ebfn l\u00e0 c\u00e1ch th\u00eam c\u00e1c ki\u1ec3u CSS tr\u1ef1c ti\u1ebfp v\u00e0o m\u1ed9t ph\u1ea7n t\u1eed HTML b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh style. N\u00f3 cho ph\u00e9p b\u1ea1n \u0111\u1ecbnh ngh\u0129a c\u00e1c ki\u1ec3u ri\u00eang bi\u1ec7t cho t\u1eebng ph\u1ea7n t\u1eed c\u1ee5 th\u1ec3, thay v\u00ec ph\u1ea3i \u00e1p d\u1ee5ng chung cho to\u00e0n b\u1ed9 trang web hay m\u1ed9t nh\u00f3m ph\u1ea7n t\u1eed.<\/span><\/p>\n<p><b>V\u00ed d\u1ee5:<\/b><\/p>\n<pre><span style=\"font-weight: 400;\">&lt;p style=\"color: #FF0000; font-size: 20px; text-align: center;\"&gt;\u0110\u00e2y l\u00e0 v\u0103n b\u1ea3n v\u1edbi CSS n\u1ed9i tuy\u1ebfn.&lt;\/p&gt;<\/span><\/pre>\n<p><b>\u01afu \u0111i\u1ec3m c\u1ee7a CSS n\u1ed9i tuy\u1ebfn<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">D\u1ec5 d\u00e0ng s\u1eed d\u1ee5ng v\u00e0 \u00e1p d\u1ee5ng cho t\u1eebng ph\u1ea7n t\u1eed c\u1ee5 th\u1ec3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Kh\u00f4ng c\u1ea7n t\u1ea1o t\u1ec7p CSS ri\u00eang.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">H\u1eefu \u00edch cho vi\u1ec7c ch\u1ec9nh s\u1eeda nhanh ch\u00f3ng.<\/span><\/li>\n<\/ul>\n<p><b>Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a CSS n\u1ed9i tuy\u1ebfn<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Kh\u00f3 qu\u1ea3n l\u00fd khi c\u1ea7n \u00e1p d\u1ee5ng cho nhi\u1ec1u ph\u1ea7n t\u1eed.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">M\u00e3 HTML tr\u1edf n\u00ean l\u1ed9n x\u1ed9n v\u00e0 kh\u00f3 \u0111\u1ecdc.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Kh\u00f4ng ph\u00f9 h\u1ee3p cho c\u00e1c d\u1ef1 \u00e1n l\u1edbn ho\u1eb7c ph\u1ee9c t\u1ea1p.<\/span><\/li>\n<\/ul>\n<h3><b>CSS n\u1ed9i b\u1ed9<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">CSS n\u1ed9i b\u1ed9 (hay c\u00f2n g\u1ecdi l\u00e0 CSS nh\u00fang) l\u00e0 c\u00e1ch th\u00eam c\u00e1c ki\u1ec3u CSS v\u00e0o b\u00ean trong trang HTML b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng th\u1ebb &lt;style&gt;. N\u00f3 cho ph\u00e9p b\u1ea1n \u0111\u1ecbnh ngh\u0129a c\u00e1c ki\u1ec3u CSS cho to\u00e0n b\u1ed9 trang web ho\u1eb7c cho m\u1ed9t ph\u1ea7n c\u1ee5 th\u1ec3 c\u1ee7a trang m\u00e0 kh\u00f4ng c\u1ea7n t\u1ea1o t\u1ec7p CSS ri\u00eang.<\/span><\/p>\n<p><strong>V\u00ed d\u1ee5:\u00a0<\/strong><\/p>\n<pre>&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n\r\n&lt;head&gt;\r\n&lt;title&gt;CSS n\u1ed9i b\u1ed9&lt;\/title&gt;\r\n&lt;style&gt;\r\n\r\nbody {\r\n\r\n\u00a0\u00a0font-family: Arial, sans-serif;\r\n\u00a0\u00a0font-size: 16px;\r\n\u00a0\u00a0color: #333;\r\n\r\n}\r\n\r\nh1 {\r\n\r\n\u00a0\u00a0text-align: center;\r\n\u00a0\u00a0font-size: 24px;\r\n\u00a0\u00a0margin: 20px 0;\r\n\r\n}\r\n\r\np {\r\n\r\n\u00a0\u00a0line-height: 1.5;\r\n\r\n}\r\n\r\n&lt;\/style&gt;\r\n&lt;\/head&gt;\r\n\r\n&lt;body&gt;\r\n\r\n&lt;h1&gt;Ti\u00eau \u0111\u1ec1&lt;\/h1&gt;\r\n&lt;p&gt;\u0110\u00e2y l\u00e0 n\u1ed9i dung \u0111o\u1ea1n v\u0103n b\u1ea3n.&lt;\/p&gt;\r\n\r\n&lt;\/body&gt;\r\n\r\n&lt;\/html&gt;<\/pre>\n<p><b>\u01afu \u0111i\u1ec3m c\u1ee7a CSS n\u1ed9i b\u1ed9<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">D\u1ec5 s\u1eed d\u1ee5ng v\u00e0 tri\u1ec3n khai.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Gi\u1eef cho m\u00e3 HTML g\u1ecdn g\u00e0ng, d\u1ec5 qu\u1ea3n l\u00fd.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Kh\u00f4ng c\u1ea7n t\u1ea1o t\u1ec7p CSS ri\u00eang.<\/span><\/li>\n<\/ul>\n<p><b>Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a CSS n\u1ed9i b\u1ed9<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Kh\u00f3 ch\u1ec9nh s\u1eeda v\u00e0 b\u1ea3o tr\u00ec khi code ph\u1ee9c t\u1ea1p.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Kh\u00f3 chia s\u1ebb v\u00e0 t\u00e1i s\u1eed d\u1ee5ng cho c\u00e1c trang kh\u00e1c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Kh\u00f4ng ph\u00f9 h\u1ee3p cho c\u00e1c d\u1ef1 \u00e1n l\u1edbn ho\u1eb7c nhi\u1ec1u trang web.<\/span><\/li>\n<\/ul>\n<h3><b> CSS b\u00ean ngo\u00e0i<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">CSS b\u00ean ngo\u00e0i l\u00e0 c\u00e1ch th\u00eam c\u00e1c ki\u1ec3u CSS v\u00e0o m\u1ed9t trang web b\u1eb1ng c\u00e1ch l\u01b0u tr\u1eef ch\u00fang trong m\u1ed9t t\u1ec7p ri\u00eang (th\u01b0\u1eddng c\u00f3 ph\u1ea7n m\u1edf r\u1ed9ng .css) v\u00e0 li\u00ean k\u1ebft t\u1ec7p \u0111\u00f3 v\u1edbi trang HTML b\u1eb1ng th\u1ebb &lt;link&gt;. N\u00f3 cho ph\u00e9p b\u1ea1n \u0111\u1ecbnh ngh\u0129a c\u00e1c ki\u1ec3u CSS cho to\u00e0n b\u1ed9 trang web ho\u1eb7c cho m\u1ed9t ph\u1ea7n c\u1ee5 th\u1ec3 c\u1ee7a trang m\u00e0 kh\u00f4ng c\u1ea7n nh\u00fang tr\u1ef1c ti\u1ebfp v\u00e0o HTML.<\/span><\/p>\n<p><em><strong>V\u00ed d\u1ee5:<\/strong><\/em><\/p>\n<table>\n<tbody>\n<tr>\n<td style=\"text-align: left;\"><b>CSS<\/b><\/td>\n<td>\n<p style=\"text-align: left;\"><b>HTML<\/b><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\">\n<pre><span style=\"font-weight: 400;\">\/* style.css *\/<\/span>\r\n\r\n<span style=\"font-weight: 400;\">body {<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0font-family: Arial, sans-serif;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0font-size: 16px;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0color: #333;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">}<\/span>\r\n\r\n<span style=\"font-weight: 400;\">h1 {<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0text-align: center;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0font-size: 24px;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0margin: 20px 0;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">}<\/span>\r\n\r\n<span style=\"font-weight: 400;\">p {<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0line-height: 1.5;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">}<\/span><\/pre>\n<\/td>\n<td style=\"text-align: left;\">\n<pre><span style=\"font-weight: 400;\">&lt;!DOCTYPE html&gt;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">&lt;html&gt;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">&lt;head&gt;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">&lt;title&gt;CSS b\u00ean ngo\u00e0i&lt;\/title&gt;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">&lt;link rel=\"stylesheet\" href=\"style.css\"&gt;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">&lt;\/head&gt;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">&lt;body&gt;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">&lt;h1&gt;Ti\u00eau \u0111\u1ec1&lt;\/h1&gt;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">&lt;p&gt;\u0110\u00e2y l\u00e0 n\u1ed9i dung \u0111o\u1ea1n v\u0103n b\u1ea3n.&lt;\/p&gt;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">&lt;\/body&gt;<\/span>\r\n\r\n<span style=\"font-weight: 400;\">&lt;\/html&gt;<\/span><\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><b>\u01afu \u0111i\u1ec3m c\u1ee7a CSS b\u00ean ngo\u00e0i<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">D\u1ec5 d\u00e0ng qu\u1ea3n l\u00fd v\u00e0 ch\u1ec9nh s\u1eeda code.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Gi\u1eef cho m\u00e3 HTML g\u1ecdn g\u00e0ng, d\u1ec5 \u0111\u1ecdc.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">T\u0103ng kh\u1ea3 n\u0103ng chia s\u1ebb v\u00e0 t\u00e1i s\u1eed d\u1ee5ng code.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Gi\u1ea3m b\u1edbt k\u00edch th\u01b0\u1edbc c\u1ee7a t\u1eadp tin HTML, \u0111\u1ed3ng th\u1eddi nh\u1eefng t\u1eadp tin CSS c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ea3i song song. V\u00e0 khi ch\u00fang \u0111\u01b0\u1ee3c t\u1ea3i l\u1ea7n \u0111\u1ea7u, s\u1ebd \u0111\u01b0\u1ee3c tr\u00ecnh duy\u1ec7t l\u01b0u v\u00e0o b\u1ed9 nh\u1edb \u0111\u1ec7m, t\u1eeb l\u1ea7n truy c\u1eadp web th\u1ee9 2 tr\u1edf \u0111i, tr\u00ecnh duy\u1ec7t kh\u00f4ng c\u1ea7n t\u1ea3i l\u1ea1i ch\u00fang n\u1ebfu ch\u00fang kh\u00f4ng b\u1ecb thay \u0111\u1ed5i, gi\u00fap cho qu\u00e1 tr\u00ecnh t\u1ea3i web nhanh h\u01a1n nhi\u1ec1u.<\/span><\/li>\n<\/ul>\n<p><b>Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a CSS b\u00ean ngo\u00e0i<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Y\u00eau c\u1ea7u ki\u1ebfn th\u1ee9c v\u1ec1 HTML v\u00e0 CSS.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t trang web n\u1ebfu t\u1ec7p CSS qu\u00e1 l\u1edbn.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u1ea7n ki\u1ec3m tra li\u00ean k\u1ebft gi\u1eefa t\u1ec7p CSS v\u00e0 HTML.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cac_cau_hoi_ve_CSS_la_gi_thuong_gap\"><\/span><b> C\u00e1c c\u00e2u h\u1ecfi <\/b><b>v\u1ec1 CSS l\u00e0 g\u00ec <\/b><b>th\u01b0\u1eddng g\u1eb7p<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>M\u1ed1i quan h\u1ec7 gi\u1eefa CSS v\u00e0 HTML l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">L\u00e0 ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u si\u00eau v\u0103n b\u1ea3n, HTML \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o c\u00e1c trang web t\u0129nh. Trong khi \u0111\u00f3, CSS l\u00e0 ng\u00f4n ng\u1eef bi\u1ec3u \u0111\u1ecbnh ki\u1ec3u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh ki\u1ec3u v\u00e0 c\u00e1ch tr\u00ecnh b\u00e0y t\u1ed5ng th\u1ec3 c\u1ee7a c\u00e1c t\u1ec7p v\u00e0 th\u00e0nh ph\u1ea7n trang kh\u00e1c nhau b\u1eb1ng ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u nh\u01b0 HTML.<\/span><\/p>\n<h3><b>Responsive CSS l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Responsive CSS l\u00e0 k\u1ef9 thu\u1eadt s\u1eed d\u1ee5ng CSS \u0111\u1ec3 thi\u1ebft k\u1ebf giao di\u1ec7n web c\u00f3 th\u1ec3 t\u1ef1 \u0111\u1ed9ng th\u00edch \u1ee9ng v\u1edbi k\u00edch th\u01b0\u1edbc m\u00e0n h\u00ecnh c\u1ee7a thi\u1ebft b\u1ecb m\u00e0 ng\u01b0\u1eddi d\u00f9ng \u0111ang s\u1eed d\u1ee5ng. Nh\u1edd \u0111\u00f3, website c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb \u0111\u1eb9p m\u1eaft v\u00e0 d\u1ec5 s\u1eed d\u1ee5ng tr\u00ean m\u1ecdi thi\u1ebft b\u1ecb, t\u1eeb desktop, laptop, tablet \u0111\u1ebfn smartphone.<\/span><\/p>\n<h3><b>Reset CSS l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Reset CSS l\u00e0 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c quy t\u1eafc CSS \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00f3a \u0111\u1ecbnh d\u1ea1ng m\u1eb7c \u0111\u1ecbnh c\u1ee7a tr\u00ecnh duy\u1ec7t cho c\u00e1c ph\u1ea7n t\u1eed HTML. N\u00f3 gi\u00fap lo\u1ea1i b\u1ecf s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 hi\u1ec3n th\u1ecb tr\u00ean c\u00e1c tr\u00ecnh duy\u1ec7t kh\u00e1c nhau v\u00e0 t\u1ea1o ra m\u1ed9t n\u1ec1n t\u1ea3ng th\u1ed1ng nh\u1ea5t \u0111\u1ec3 b\u1ea1n b\u1eaft \u0111\u1ea7u \u0111\u1ecbnh d\u1ea1ng website c\u1ee7a m\u00ecnh.<\/span><\/p>\n<h3><b>C\u00f3 nh\u1eefng framework CSS n\u00e0o ph\u1ed5 bi\u1ebfn?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 framework CSS \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nhi\u1ec1u nh\u01b0 Bootstrap, Foundation, Materialize, Bulma, Ulkit, Semantic UI, Pure CSS, Milligram,&#8230; \u0110\u1ec3 ch\u1ecdn framework ph\u00f9 h\u1ee3p, tr\u01b0\u1edbc ti\u00ean b\u1ea1n c\u1ea7n x\u00e1c \u0111\u1ecbnh nhu c\u1ea7u c\u1ee7a d\u1ef1 \u00e1n. Sau \u0111\u00f3, c\u00e2n nh\u1eafc v\u1ec1 \u0111\u1ed9 ph\u1ee9c t\u1ea1p, t\u00ednh n\u0103ng, kh\u1ea3 n\u0103ng t\u00f9y ch\u1ec9nh,&#8230; Ngo\u00e0i ra, h\u00e3y tham kh\u1ea3o th\u00eam c\u00e1c \u0111\u00e1nh gi\u00e1 v\u00e0 so s\u00e1nh c\u00e1c framework CSS.<\/span><\/p>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/framework-la-gi-top-framework-pho-bien-nhat\/\" target=\"_blank\" rel=\"noopener\"><strong>Top 15+ framework back-end, front-end v\u00e0 mobile ph\u1ed5 bi\u1ebfn nh\u1ea5t 2024<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>M\u00f4 h\u00ecnh h\u1ed9p CSS (CSS Box Model) g\u1ed3m nh\u1eefng th\u00e0nh ph\u1ea7n n\u00e0o?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">M\u00f4 h\u00ecnh h\u1ed9p CSS x\u00e1c \u0111\u1ecbnh b\u1ed1 c\u1ee5c v\u00e0 thi\u1ebft k\u1ebf c\u1ee7a c\u00e1c ph\u1ea7n t\u1eed CSS g\u1ed3m n\u1ed9i dung (nh\u01b0 v\u0103n b\u1ea3n v\u00e0 h\u00ecnh \u1ea3nh, ph\u1ea7n \u0111\u1ec7m (v\u00f9ng xung quanh n\u1ed9i dung), \u0111\u01b0\u1eddng vi\u1ec1n (v\u00f9ng xung quanh ph\u1ea7n \u0111\u1ec7m) v\u00e0 l\u1ec1 (v\u00f9ng xung quanh \u0111\u01b0\u1eddng vi\u1ec1n).<\/span><\/p>\n<h3><b>\u01afu \u0111i\u1ec3m v\u00e0 h\u1ea1n ch\u1ebf c\u1ee7a CSS l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">\u01afu \u0111i\u1ec3m c\u1ee7a CSS:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u00e1ch bi\u1ec7t n\u1ed9i dung v\u00e0 giao di\u1ec7n: <\/b><span style=\"font-weight: 400;\">CSS n\u1ed9i b\u1ed9 v\u00e0 CSS b\u00ean ngo\u00e0i c\u00f3 th\u1ec3 t\u00e1ch bi\u1ec7t n\u1ed9i dung (HTML) v\u00e0 giao di\u1ec7n (CSS) c\u1ee7a website, gi\u00fap cho vi\u1ec7c qu\u1ea3n l\u00fd v\u00e0 c\u1eadp nh\u1eadt website d\u1ec5 d\u00e0ng h\u01a1n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ki\u1ec3m so\u00e1t giao di\u1ec7n: <\/b><span style=\"font-weight: 400;\">CSS cho ph\u00e9p b\u1ea1n ki\u1ec3m so\u00e1t ho\u00e0n to\u00e0n giao di\u1ec7n c\u1ee7a website, bao g\u1ed3m m\u00e0u s\u1eafc, font ch\u1eef, b\u1ed1 c\u1ee5c, v.v.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Responsive design: <\/b><span style=\"font-weight: 400;\">CSS gi\u00fap b\u1ea1n t\u1ea1o ra website c\u00f3 th\u1ec3 t\u1ef1 \u0111\u1ed9ng th\u00edch \u1ee9ng v\u1edbi k\u00edch th\u01b0\u1edbc m\u00e0n h\u00ecnh c\u1ee7a m\u1ecdi thi\u1ebft b\u1ecb.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u0103ng t\u1ed1c \u0111\u1ed9 t\u1ea3i trang: <\/b><span style=\"font-weight: 400;\">CSS b\u00ean ngo\u00e0i gi\u00fap gi\u1ea3m k\u00edch th\u01b0\u1edbc c\u1ee7a trang web b\u1eb1ng c\u00e1ch t\u00e1ch bi\u1ec7t n\u1ed9i dung v\u00e0 giao di\u1ec7n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u0103ng kh\u1ea3 n\u0103ng truy c\u1eadp: <\/b><span style=\"font-weight: 400;\">CSS gi\u00fap website d\u1ec5 s\u1eed d\u1ee5ng h\u01a1n cho ng\u01b0\u1eddi d\u00f9ng c\u00f3 khi\u1ebfm khuy\u1ebft.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">H\u1ea1n ch\u1ebf c\u1ee7a CSS:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Kh\u00f3 h\u1ecdc: <\/b><span style=\"font-weight: 400;\">CSS c\u00f3 th\u1ec3 kh\u00f3 h\u1ecdc \u0111\u1ed1i v\u1edbi ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ph\u1ee5 thu\u1ed9c v\u00e0o tr\u00ecnh duy\u1ec7t:<\/b><span style=\"font-weight: 400;\"> C\u00e1c tr\u00ecnh duy\u1ec7t kh\u00e1c nhau c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb m\u1ed9t s\u1ed1 th\u00e0nh ph\u1ea7n CSS kh\u00e1c nhau.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Kh\u00f3 kh\u0103n trong vi\u1ec7c debug: <\/b><span style=\"font-weight: 400;\">Vi\u1ec7c t\u00ecm ki\u1ebfm l\u1ed7i CSS c\u00f3 th\u1ec3 kh\u00f3 kh\u0103n. Tuy nhi\u00ean, b\u1ea1n c\u00f3 th\u1ec3 nh\u1edd t\u1edbi s\u1ef1 h\u1ed7 tr\u1ee3 c\u1ee7a Chrome DevTools ho\u1eb7c Firefox Developer Edition.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c h\u1ea1n ch\u1ebf: <\/b><span style=\"font-weight: 400;\">CSS kh\u00f4ng th\u1ec3 t\u1ea1o ra c\u00e1c hi\u1ec7u \u1ee9ng t\u01b0\u01a1ng t\u00e1c ph\u1ee9c t\u1ea1p.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Tong_ket_ve_CSS_la_gi\"><\/span><b>T\u1ed5ng k\u1ebft v\u1ec1 CSS l\u00e0 g\u00ec<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Qua b\u00e0i vi\u1ebft tr\u00ean, c\u00f3 th\u1ec3 th\u1ea5y CSS l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong vi\u1ec7c x\u00e2y d\u1ef1ng v\u00e0 thi\u1ebft k\u1ebf web. Hy v\u1ecdng nh\u1eefng ki\u1ebfn th\u1ee9c ITviec cung c\u1ea5p trong b\u00e0i \u0111\u00e3 gi\u00fap b\u1ea1n hi\u1ec3u h\u01a1n v\u1ec1 CSS l\u00e0 g\u00ec c\u0169ng nh\u01b0 c\u00e1ch s\u1eed d\u1ee5ng ng\u00f4n ng\u1eef n\u00e0y.\u00a0<\/span><\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" class=\"sp-no-webp wp-image-5668 aligncenter sp-no-webp entered lazyloaded\" src=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2.png\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" srcset=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2.png 300w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2-200x200.png 200w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2-60x60.png 60w\" alt=\"robby-2\" width=\"300\" height=\"300\" data-lazy-src=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2.png\" data-lazy-sizes=\"(max-width: 300px) 100vw, 300px\" data-lazy-srcset=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2.png 300w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2-200x200.png 200w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2-60x60.png 60w\" data-ll-status=\"loaded\" \/><\/figure>\n<\/div>\n<p id=\"block-bdf220a1-3635-4794-9101-81d879939b92\" class=\"has-text-align-center\" style=\"text-align: center;\"><strong>B\u1ea1n th\u1ea5y b\u00e0i vi\u1ebft hay v\u00e0 h\u1eefu \u00edch? \u0110\u1eebng ng\u1ea1i Share v\u1edbi b\u1ea1n b\u00e8 v\u00e0 \u0111\u1ed3ng nghi\u1ec7p nh\u00e9.<\/strong><\/p>\n<p id=\"block-a1315aab-406f-48df-97fc-6b9584e6e134\" class=\"has-text-align-center\" style=\"text-align: center;\"><strong>V\u00e0 nhanh tay tham kh\u1ea3o\u00a0<a href=\"http:\/\/itviec.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">vi\u1ec7c l\u00e0m IT<\/a>\u00a0\u201cch\u1ea5t\u201d tr\u00ean ITviec<\/strong>!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CSS c\u00f9ng v\u1edbi HTML v\u00e0 JavaScript l\u00e0 ba c\u00f4ng ngh\u1ec7 c\u1ed1t l\u00f5i \u0111\u1ed1i v\u1edbi m\u1ed9t Web Developer. N\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c v\u00e0 s\u1eed d\u1ee5ng th\u00e0nh th\u1ea1o CSS gi\u00fap b\u1ea1n t\u1ea1o ra c\u00e1c website \u0111\u1eb9p m\u1eaft, d\u1ec5 s\u1eed d\u1ee5ng, c\u00f3 kh\u1ea3 n\u0103ng truy c\u1eadp cao v\u00e0 hi\u1ec7u su\u1ea5t t\u1ed1t. N\u1ebfu b\u1ea1n \u0111ang t\u00ecm hi\u1ec3u CSS l\u00e0 [&hellip;]<\/p>\n","protected":false},"author":213,"featured_media":65509,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[109],"tags":[],"class_list":["post-65477","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chuyen-mon-it"],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>CSS l\u00e0 g\u00ec? H\u01b0\u1edbng d\u1eabn s\u1eed d\u1ee5ng CSS thi\u1ebft k\u1ebf web hi\u1ec7u qu\u1ea3 - ITviec Blog<\/title>\n<meta name=\"description\" content=\"CSS c\u00f9ng v\u1edbi HTML v\u00e0 JavaScript l\u00e0 ba c\u00f4ng ngh\u1ec7 c\u1ed1t l\u00f5i t\u1ea1o n\u00ean m\u1ed9t website. B\u00e0i vi\u1ebft gi\u1ea3i \u0111\u00e1p CSS l\u00e0 g\u00ec v\u00e0 c\u00e1ch s\u1eed d\u1ee5ng CSS hi\u1ec7u qu\u1ea3 nh\u1ea5t.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/itviec.com\/blog\/css-la-gi\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CSS l\u00e0 g\u00ec? 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N\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c v\u00e0 s\u1eed d\u1ee5ng th\u00e0nh th\u1ea1o CSS gi\u00fap b\u1ea1n t\u1ea1o ra c\u00e1c\" \/>\n<meta property=\"og:url\" content=\"https:\/\/itviec.com\/blog\/css-la-gi\/\" \/>\n<meta property=\"og:site_name\" content=\"ITviec Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/ITviec\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-31T04:15:42+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-12T07:00:32+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/03\/Thumbnail-css-vippro.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"790\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Linh Trao\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ITviec\" \/>\n<meta name=\"twitter:site\" content=\"@ITviec\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Linh Trao\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"19 ph\u00fat\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"CSS l\u00e0 g\u00ec? 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