{"id":8681,"date":"2023-10-07T20:37:40","date_gmt":"2023-10-07T13:37:40","guid":{"rendered":"https:\/\/teky.edu.vn\/blog\/?p=8681"},"modified":"2023-10-20T09:40:39","modified_gmt":"2023-10-20T02:40:39","slug":"z-index-trong-css","status":"publish","type":"post","link":"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/","title":{"rendered":"Z-index trong CSS l\u00e0 g\u00ec? \u01afu \u0111i\u1ec3m c\u1ee7a ch\u00fang l\u00e0 g\u00ec?"},"content":{"rendered":"\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-top\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;8681&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;top&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;0\\\/5 - (0 b\u00ecnh ch\u1ecdn)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Z-index trong CSS l\u00e0 g\u00ec? \u01afu \u0111i\u1ec3m c\u1ee7a ch\u00fang l\u00e0 g\u00ec?&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            <span class=\"kksr-muted\">Rate this post<\/span>\n    <\/div>\n    <\/div>\n<p style=\"text-align: justify;\"><em><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng, Z-index l\u00e0 m\u1ed9t thu\u1ed9c t\u00ednh \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u ng\u01b0\u1eddi quan t\u00e2m v\u00e0 mu\u1ed1n t\u00ecm hi\u1ec3u. N\u1ebfu nh\u01b0 b\u1ea1n c\u00f2n nhi\u1ec1u v\u1ea5n \u0111\u1ec1 ch\u01b0a bi\u1ebft v\u1ec1 thu\u1ed9c t\u00ednh<strong> Z-index trong CSS<\/strong> n\u00e0y, ngo\u00e0i ra mu\u1ed1n bi\u1ebft t\u01b0\u1eddng t\u1eadn nh\u1eefng \u01b0u \u0111i\u1ec3m c\u1ee7a Z-index css th\u00ec \u0111\u00e2y s\u1ebd l\u00e0 b\u00e0i vi\u1ebft m\u00e0 b\u1ea1n c\u1ea7n \u0111\u1ecdc. B\u1eaft \u0111\u1ea7u ngay th\u00f4i.<\/span><\/em><\/p>\n<figure id=\"attachment_8676\" aria-describedby=\"caption-attachment-8676\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8676\" src=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/08\/z-index-trong-css-cuc-ky-quan-trong.jpg\" alt=\"Z-index trong CSS c\u1ef1c k\u1ef3 quan tr\u1ecdng\" width=\"650\" height=\"400\" srcset=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/08\/z-index-trong-css-cuc-ky-quan-trong.jpg 650w, https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/08\/z-index-trong-css-cuc-ky-quan-trong-400x246.jpg 400w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><figcaption id=\"caption-attachment-8676\" class=\"wp-caption-text\">Z-index trong CSS c\u1ef1c k\u1ef3 quan tr\u1ecdng<\/figcaption><\/figure>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 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 <\/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:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Z-index_trong_CSS_la_gi\" >Z-index trong 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:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Mot_vi_du_ve_Z-index_trong_CSS\" >M\u1ed9t v\u00ed d\u1ee5 v\u1ec1 Z-index trong CSS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Tim_hieu_ky_hon_ve_Z-index_trong_CSS\" >T\u00ecm hi\u1ec3u k\u1ef9 h\u01a1n v\u1ec1 Z-index trong CSS<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Stacking_Order\" >Stacking Order<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Stacking_Contexts\" >Stacking Contexts<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Uu_diem_cua_CSS_%E2%80%93_Z-Index_trong_CSS\" >\u01afu \u0111i\u1ec3m c\u1ee7a CSS &#8211; Z-Index trong CSS<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Cung_cap_da_dang_thuoc_tinh_khac_nhau\" >Cung c\u1ea5p \u0111a d\u1ea1ng thu\u1ed9c t\u00ednh kh\u00e1c nhau<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Tiet_kiem_duoc_nhieu_thoi_gian_cho_nguoi_dung\" >Ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c nhi\u1ec1u th\u1eddi gian cho ng\u01b0\u1eddi d\u00f9ng<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Giai_quyet_duoc_cac_van_de_lon\" >Gi\u1ea3i quy\u1ebft \u0111\u01b0\u1ee3c c\u00e1c v\u1ea5n \u0111\u1ec1 l\u1edbn\u00a0<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Phien_ban_CSS_cai_tien_ra_sao\" >Phi\u00ean b\u1ea3n CSS c\u1ea3i ti\u1ebfn ra sao?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Hoc_vien_cong_nghe_Teky_la_noi_hoc_lap_trinh_hang_dau_Viet_Nam\" >H\u1ecdc vi\u1ec7n c\u00f4ng ngh\u1ec7 Teky l\u00e0 n\u01a1i h\u1ecdc l\u1eadp tr\u00ecnh h\u00e0ng \u0111\u1ea7u Vi\u1ec7t Nam<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Day_la_chuong_trinh_khong_chi_trang_bi_kien_thuc_lap_trinh_ma_con_ren_luyen_nhom_ky_nang_4Cs_Tre_se_duoc\" >\u0110\u00e2y l\u00e0 ch\u01b0\u01a1ng tr\u00ecnh kh\u00f4ng ch\u1ec9 trang b\u1ecb ki\u1ebfn th\u1ee9c l\u1eadp tr\u00ecnh m\u00e0 c\u00f2n r\u00e8n luy\u1ec7n nh\u00f3m k\u1ef9 n\u0103ng 4Cs. Tr\u1ebb s\u1ebd \u0111\u01b0\u1ee3c:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/#Lien_he_ngay_hoc_vien_cong_nghe_sang_tao_TEKY_de_duoc_tu_van_khoa_hoc\" >Li\u00ean h\u1ec7 ngay h\u1ecdc vi\u1ec7n c\u00f4ng ngh\u1ec7 s\u00e1ng t\u1ea1o TEKY \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n kh\u00f3a h\u1ecdc:<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Z-index_trong_CSS_la_gi\"><\/span><b>Z-index trong CSS l\u00e0 g\u00ec?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Nhi\u1ec1u ng\u01b0\u1eddi kh\u00f4ng bi\u1ebft Z-index trong CSS l\u00e0 g\u00ec. Th\u1ef1c t\u1ebf, \u0111\u00e2y l\u00e0 c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng m\u00e0 m\u1ed7i element \u1edf b\u00ean trong trang web \u0111\u1ec1u \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb m\u1ed9t c\u00e1ch tinh t\u1ebf theo hai chi\u1ec1u ngang v\u00e0 d\u1ecdc v\u1edbi hai tr\u1ee5c ch\u00ednh l\u00e0 x v\u00e0 y. Th\u1eadm ch\u00ed, v\u1edbi c\u00e1ch th\u1ee9c th\u00f4ng minh h\u01a1n so v\u1edbi nhi\u1ec1u ph\u1ea7n m\u1ec1m kh\u00e1c, ch\u00fang \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb th\u00eam chi\u1ec1u z v\u1edbi th\u1ee9 t\u1ef1 ch\u1ed3ng l\u1ea5n \u0111\u1ec3 ng\u01b0\u1eddi s\u1eed d\u1ee5ng c\u00f3 th\u1ec3 l\u00e0m vi\u1ec7c d\u1ec5 d\u00e0ng. Hi\u1ec3u m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n h\u01a1n, n\u1ebfu nh\u01b0 Z-index c\u00e0ng cao th\u00ec element \u0111\u00f3 s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ee9ng tr\u01b0\u1edbc v\u00e0 hi\u1ec7n l\u00ean b\u00ean tr\u00ean.<\/span><\/p>\n<p><a href=\"https:\/\/lotrinhlaptrinh.teky.vn\/?utm_id=ContentBlog&amp;utm_medium=Click_Blog&amp;utm_source=ContentBlog\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-22416\" src=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2023\/10\/dang-ky-lap-trinh-teky.gif\" alt=\"dang-ky-lap-trinh\" width=\"600\" height=\"314\" \/><\/a><\/p>\n<p><em><strong>M\u1eddi b\u1ea1n \u0111\u1ecdc tham kh\u1ea3o th\u00eam<\/strong>:<span style=\"color: #0000ff;\"> <a class=\"LinkSuggestion__Link-sc-1gewdgc-4 evyocv\" style=\"color: #0000ff;\" href=\"https:\/\/teky.edu.vn\/blog\/css-la-gi\/\" target=\"_blank\" rel=\"noopener\">CSS l\u00e0 g\u00ec? L\u00fd do t\u1ea1i sao n\u00ean s\u1eed d\u1ee5ng CSS l\u00e0 g\u00ec b\u1ea1n c\u00f3 bi\u1ebft?<\/a><\/span><\/em><\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Mot_vi_du_ve_Z-index_trong_CSS\"><\/span><b>M\u1ed9t v\u00ed d\u1ee5 v\u1ec1 Z-index trong CSS<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Sau khi bi\u1ebft v\u1ec1 Z-index l\u00e0 g\u00ec, v\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y s\u1ebd gi\u00fap b\u1ea1n c\u1ee7ng c\u1ed1 th\u00eam \u0111\u1ecbnh ngh\u0129a v\u1ec1 Z-index trong CSS \u0111\u1ec3 b\u1ea1n c\u00f3 th\u1ec3 hi\u1ec3u v\u00e0 tham kh\u1ea3o \u0111\u01b0\u1ee3c k\u1ef9 c\u00e0ng nh\u1ea5t. Cho 3 kh\u1ed1i x\u00e1m, xanh, v\u00e0ng \u0111\u1ec1u \u0111\u01b0\u1ee3c tr\u1ef1c thu\u1ed9c tr\u1ef1c ti\u1ebfp \u1edf trong m\u1ed9t div v\u1edbi class l\u00e0 teky-demo. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 gi\u00fap cho c\u1ea3 3 kh\u1ed1i s\u1ebd c\u00f9ng thu\u1ed9c v\u00e0o m\u1ed9t stacking context.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Ngo\u00e0i ra, trong c\u00f9ng m\u1ed9t stacking context theo \u0111\u00fang th\u1ee9 t\u1ef1 t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi s\u1ebd \u0111\u01b0\u1ee3c tu\u00e2n theo m\u1ed9t quy t\u1eafc r\u00f5 r\u1ec7t: v\u1edbi nh\u1eefng element c\u00f3 Z-index cao h\u01a1n th\u00ec ch\u00fang s\u1ebd hi\u1ec7n l\u00ean b\u00ean tr\u00ean. C\u00f2n v\u1edbi nh\u1eefng element n\u00e0o c\u00f3 Z-index theo set th\u00ec th\u1ee9 t\u1ef1 c\u1ee7a ch\u00fang s\u1ebd b\u1ecb ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ef1 xu\u1ea5t hi\u1ec7n t\u1eeb tr\u01b0\u1edbc ra sau c\u1ee7a m\u1ed9t DOM free.\u00a0<\/span><\/p>\n<figure id=\"attachment_8677\" aria-describedby=\"caption-attachment-8677\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8677\" src=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/08\/chuong-trinh-z-index-khong-phuc-tap.jpg\" alt=\"Ch\u01b0\u01a1ng tr\u00ecnh Z-index kh\u00f4ng ph\u1ee9c t\u1ea1p\" width=\"650\" height=\"400\" srcset=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/08\/chuong-trinh-z-index-khong-phuc-tap.jpg 650w, https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/08\/chuong-trinh-z-index-khong-phuc-tap-400x246.jpg 400w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><figcaption id=\"caption-attachment-8677\" class=\"wp-caption-text\">Ch\u01b0\u01a1ng tr\u00ecnh Z-index kh\u00f4ng ph\u1ee9c t\u1ea1p<\/figcaption><\/figure>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Tim_hieu_ky_hon_ve_Z-index_trong_CSS\"><\/span><b>T\u00ecm hi\u1ec3u k\u1ef9 h\u01a1n v\u1ec1 Z-index trong CSS<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Stacking_Order\"><\/span><b>Stacking Order<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 n\u00f3i r\u1eb1ng \u0111\u00e2y l\u00e0 m\u1ed9t v\u1ea5n \u0111\u1ec1 nan gi\u1ea3i \u0111\u1ed1i v\u1edbi Z index trong CSS. Ch\u00fang v\u00f4 c\u00f9ng \u0111\u01a1n gi\u1ea3n v\u00e0 kh\u00f4ng c\u00f3 g\u00ec g\u00e2y kh\u00f3 kh\u0103n v\u1edbi nh\u1eefng ng\u01b0\u1eddi l\u00e0m l\u00e2u n\u0103m, b\u1edfi th\u1ebf m\u00e0 h\u1ea7u h\u1ebft nh\u1eefng ng\u01b0\u1eddi ph\u00e1t tri\u1ec3n s\u1ebd b\u1ecf qua th\u1eddi gian \u0111\u1ecdc hi\u1ec3u c\u00e1c lu\u1eadt l\u1ec7 c\u1ea7n ph\u00e1t tri\u1ec3n c\u1ee7a n\u00f3.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Ngo\u00e0i ra, m\u1ecdi element \u1edf b\u00ean trong HTML khi ta th\u1ea5y \u1edf ph\u00eda tr\u01b0\u1edbc ho\u1eb7c \u1edf ph\u00eda sau c\u1ee7a c\u00e1c element kh\u00e1c b\u00ean trong document \u0111\u1ec1u \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 th\u1ee9 t\u1ef1 x\u1ebfp l\u1edbp.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Khi ch\u1ee9a c\u1ea3 hai thu\u1ed9c t\u00ednh Z-index v\u00e0 position, ch\u00fang c\u00f3 quy lu\u1eadt kh\u00f4ng g\u00e2y kh\u00f3 kh\u0103n l\u00e0: th\u1ee9 t\u1ef1 x\u1ebfp l\u1edbp \u1edf \u0111\u00e2y ch\u00ednh l\u00e0 th\u1ee9 t\u1ef1 \u0111\u01b0\u1ee3c xu\u1ea5t hi\u1ec7n \u1edf trong HTML.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Khi t\u00ednh t\u1edbi thu\u1ed9c t\u00ednh position th\u00ec ta c\u00f3 th\u1ec3 th\u1ea5y \u0111\u01b0\u1ee3c c\u00e1c element \u0111\u1ec1u \u0111\u01b0\u1ee3c g\u00e1n position, b\u1edfi th\u1ebf ch\u00fang xu\u1ea5t hi\u1ec7n \u1edf ph\u00eda tr\u01b0\u1edbc b\u1ea5t k\u1ef3 m\u1ed9t lo\u1ea1i element n\u00e0o kh\u00f4ng c\u00f3 g\u00e1n position.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ngo\u00e0i ra, ta c\u00f3 th\u1ec3 coi c\u00e1c element v\u1edbi nh\u1eefng gi\u00e1 tr\u1ecb z index css cao h\u01a1n \u0111\u1ee9ng \u0111\u1eb1ng tr\u01b0\u1edbc element v\u1edbi thu\u1ed9c t\u00ednh z-index th\u1ea5p h\u01a1n.\u00a0<\/span><\/li>\n<\/ul>\n<p><a href=\"https:\/\/lotrinhlaptrinh.teky.vn\/?utm_id=ContentBlog&amp;utm_medium=Click_Blog&amp;utm_source=ContentBlog\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-22417\" src=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2023\/10\/dang-ky-lap-trinh-teky1.gif\" alt=\"dang-ky-lap-trinh-teky1\" width=\"600\" height=\"314\" \/><\/a><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Stacking_Contexts\"><\/span><b>Stacking Contexts<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Ngo\u00e0i vi\u1ec7c hi\u1ec3u v\u1ec1 Z-index trong CSS, hi\u1ec3u v\u1ec1 c\u00e1c stacking contexts b\u00ean trong v\u00ed d\u1ee5 n\u00e0y s\u1ebd gi\u00fap b\u1ea1n c\u00f3 c\u00e1i nh\u00ecn \u0111a chi\u1ec1u h\u01a1n. Nh\u00f3m c\u1ee7a c\u00e1c element c\u00f3 c\u00f9ng chung m\u1ed9t g\u1ed1c s\u1ebd \u0111i chuy\u1ec3n chung \u1edf b\u00ean trong stacking order, t\u1eeb \u0111\u00f3 t\u1ea1o n\u00ean m\u1ed9t kh\u00e1i ni\u1ec7m m\u1edbi l\u00e0 kh\u00e1i ni\u1ec7m v\u1ec1 stacking context. \u1ede \u0111\u00e2y hi\u1ec3u l\u00e0 Stacking context s\u1ebd l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 gi\u00fap ta hi\u1ec3u l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 Z-index v\u00e0 stacking order ho\u1ea1t \u0111\u1ed9ng \u0111\u01b0\u1ee3c t\u1ed1t v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">B\u00ean trong m\u1ed7i m\u1ed9t stacking context s\u1ebd ch\u1ee9a m\u1ed9t HTML element, \u0111\u00e2y l\u00e0 root element. Khi c\u00f3 m\u1ed9t stacking context \u0111\u01b0\u1ee3c g\u1eafn v\u1edbi element, ch\u00fang s\u1ebd li\u00ean k\u1ebft t\u1ed1t h\u01a1n t\u1edbi nh\u1eefng element con kh\u00e1c v\u00e0o c\u00e1c v\u1ecb tr\u00ed c\u1ed1 \u0111\u1ecbnh kh\u00e1c nhau \u0111\u1ec3 t\u1eeb \u0111\u00f3 t\u1ea1o ra m\u1ed9t element \u0111\u01b0\u1ee3c n\u1eb1m b\u00ean trong context v\u00e0 d\u01b0\u1edbi c\u00f9ng c\u1ee7a stacking order. \u0110i\u1ec3m \u0111\u1eb7c bi\u1ec7t \u1edf \u0111\u00e2y l\u00e0 kh\u00f4ng c\u00f3 c\u00e1ch n\u00e0o \u0111\u1ec3 l\u00e0m cho n\u00f3 xu\u1ea5t hi\u1ec7n \u0111\u01b0\u1ee3c \u1edf ph\u00eda tr\u01b0\u1edbc c\u1ee7a m\u1ed9t v\u1ecb tr\u00ed cao h\u01a1n b\u00ean trong stacking order, k\u1ec3 c\u1ea3 khi Z-index c\u1ee7a n\u00f3 l\u00ean \u0111\u1ebfn \u0111\u01b0\u1ee3c 9999.<\/span><\/p>\n<figure id=\"attachment_8678\" aria-describedby=\"caption-attachment-8678\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8678\" src=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/08\/z-index-co-nhieu-chuc-nang-thu-vi.jpg\" alt=\"Z-index c\u00f3 nhi\u1ec1u ch\u1ee9c n\u0103ng th\u00fa v\u1ecb\" width=\"650\" height=\"400\" srcset=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/08\/z-index-co-nhieu-chuc-nang-thu-vi.jpg 650w, https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/08\/z-index-co-nhieu-chuc-nang-thu-vi-400x246.jpg 400w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><figcaption id=\"caption-attachment-8678\" class=\"wp-caption-text\">Z-index c\u00f3 nhi\u1ec1u ch\u1ee9c n\u0103ng th\u00fa v\u1ecb<\/figcaption><\/figure>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Uu_diem_cua_CSS_%E2%80%93_Z-Index_trong_CSS\"><\/span><b>\u01afu \u0111i\u1ec3m c\u1ee7a CSS &#8211; Z-Index trong CSS<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng nh\u1edd v\u00e0o Z-index trong CSS m\u00e0 CSS m\u1edbi tr\u1edf th\u00e0nh m\u1ed9t trong nh\u1eefng ph\u1ea7n m\u1ec1m, c\u00f4ng c\u1ee5 \u0111\u01b0\u1ee3c nhi\u1ec1u ng\u01b0\u1eddi l\u1ef1a ch\u1ecdn v\u00e0 t\u00ecm \u0111\u1ebfn \u0111\u1ec3 h\u1ed7 tr\u1ee3 c\u00f4ng vi\u1ec7c l\u1eadp tr\u00ecnh c\u1ee7a m\u00ecnh. Ngo\u00e0i bi\u1ebft v\u1ec1 Z-index css l\u00e0 g\u00ec, m\u1ecdi ng\u01b0\u1eddi c\u0169ng mu\u1ed1n hi\u1ec3u v\u00e0 n\u1eafm b\u1eaft th\u00eam c\u00e1c th\u00f4ng tin v\u1ec1 c\u00f4ng c\u1ee5 CSS \u0111\u1ec3 d\u1ec5 d\u00e0ng s\u1eed d\u1ee5ng h\u01a1n trong t\u01b0\u01a1ng lai n\u1ebfu c\u1ea7n. M\u1ed9t s\u1ed1 chia s\u1ebb d\u01b0\u1edbi \u0111\u00e2y c\u1ee7a ch\u00fang t\u00f4i ch\u1eafc ch\u1eafn s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u \u0111\u01b0\u1ee3c th\u00eam v\u1ec1 \u01b0u \u0111i\u1ec3m n\u00e0y.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Cung_cap_da_dang_thuoc_tinh_khac_nhau\"><\/span><b>Cung c\u1ea5p \u0111a d\u1ea1ng thu\u1ed9c t\u00ednh kh\u00e1c nhau<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng CSS c\u00f3 th\u1ec3 cung c\u1ea5p cho ng\u01b0\u1eddi d\u00f9ng nhi\u1ec1u thu\u1ed9c t\u00ednh ch\u1ea5t l\u01b0\u1ee3ng h\u01a1n, cung c\u1ea5p chi ti\u1ebft h\u01a1n nhi\u1ec1u so v\u1edbi HTML tr\u00ean ph\u1ea7n \u0111\u1ecbnh ngh\u0129a v\u1ec1 giao di\u1ec7n c\u1ee7a trang web. Qua \u0111\u00f3 ta th\u1ea5y \u0111\u01b0\u1ee3c r\u1eb1ng, CSS gi\u00fap cho ng\u01b0\u1eddi s\u1eed d\u1ee5ng c\u00f3 th\u1ec3 d\u00f9ng \u0111\u01b0\u1ee3c nhi\u1ec1u phong c\u00e1ch kh\u00e1c nhau \u1edf tr\u00ean trang web HTML, t\u1eeb \u0111\u00f3 \u0111em \u0111\u1ebfn kh\u1ea3 n\u0103ng \u0111i\u1ec1u ch\u1ec9nh cho ng\u01b0\u1eddi s\u1eed d\u1ee5ng kh\u00f4ng c\u00f3 gi\u1edbi h\u1ea1n.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Tiet_kiem_duoc_nhieu_thoi_gian_cho_nguoi_dung\"><\/span><b>Ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c nhi\u1ec1u th\u1eddi gian cho ng\u01b0\u1eddi d\u00f9ng<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Kh\u00f4ng ch\u1ec9 s\u1edf h\u1eefu thu\u1ed9c t\u00ednh Z index m\u00e0 CSS c\u00f2n c\u00f3 nhi\u1ec1u thu\u1ed9c t\u00ednh kh\u00e1c, b\u1edfi th\u1ebf ch\u00fang gi\u00fap cho ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t c\u00e1ch r\u1ea5t s\u00e1ng t\u1ea1o v\u00e0 c\u1ef1c k\u1ef3 ti\u1ebft ki\u1ec7m th\u1eddi gian. Nh\u1edd v\u00e0o vi\u1ec7c s\u1eed d\u1ee5ng n\u00e0y m\u00e0 b\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea3i l\u1eb7p l\u1ea1i s\u1ef1 thay \u0111\u1ed5i trong m\u00f4 t\u1ea3 cho t\u1eebng ph\u1ea7n, do \u0111\u00f3 b\u1ea1n c\u00f3 th\u1ec3 ti\u1ebft ki\u1ec7m c\u00f4ng s\u1ee9c \u0111\u1ec3 c\u00f3 th\u1ec3 ho\u00e0n th\u00e0nh c\u00f4ng vi\u1ec7c m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00e1ch CSS t\u1ea1o ra s\u1ebd mang \u0111\u1ebfn nhi\u1ec1u style kh\u00e1c nhau \u0111\u1ec3 cho ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng \u1edf tr\u00ean c\u00e1c trang web, t\u1eeb \u0111\u00f3 l\u00e0m gi\u1ea3m \u0111i vi\u1ec7c l\u1eb7p \u0111i l\u1eb7p l\u1ea1i c\u00e1c \u0111\u1ecbnh d\u1ea1ng m\u1ed9t c\u00e1ch qu\u00e1 gi\u1ed1ng nhau.<\/span><\/p>\n<p><a href=\"https:\/\/lotrinhlaptrinh.teky.vn\/?utm_id=ContentBlog&amp;utm_medium=Click_Blog&amp;utm_source=ContentBlog\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-22422\" src=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2023\/10\/lap-trinh-cho-tre.gif\" alt=\"lap-trinh-cho-tre\" width=\"600\" height=\"314\" \/><\/a><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Giai_quyet_duoc_cac_van_de_lon\"><\/span><b>Gi\u1ea3i quy\u1ebft \u0111\u01b0\u1ee3c c\u00e1c v\u1ea5n \u0111\u1ec1 l\u1edbn\u00a0<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00f3 r\u1ea5t nhi\u1ec1u v\u1ea5n \u0111\u1ec1 m\u00e0 ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng bi\u1ebft ph\u1ea3i gi\u1ea3i quy\u1ebft nh\u01b0 th\u1ebf n\u00e0o trong qu\u00e1 tr\u00ecnh l\u1eadp tr\u00ecnh, th\u1ebf nh\u01b0ng nh\u1edd c\u00f3 CSS n\u00f3i chung v\u00e0 Z index n\u00f3i ri\u00eang l\u1ea1i c\u00f3 th\u1ec3 gi\u1ea3i quy\u1ebft \u0111\u01b0\u1ee3c c\u1ef1c k\u1ef3 nhanh ch\u00f3ng v\u00e0 hi\u1ec7u qu\u1ea3. Tr\u01b0\u1edbc khi CSS xu\u1ea5t hi\u1ec7n v\u00e0 tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn, ng\u01b0\u1eddi d\u00f9ng th\u01b0\u1eddng s\u1eed d\u1ee5ng nh\u1eefng th\u1ebb nh\u01b0: k\u00edch th\u01b0\u1edbc, \u0111\u01b0\u1eddng vi\u1ec1n, s\u1eafp x\u1ebfp ph\u1ea7n t\u1eed, ki\u1ec3u n\u1ec1n, m\u00e0u s\u1eafc, ph\u00f4ng ch\u1eef\u2026 v\u00e0 ph\u1ea3i l\u00e0m l\u1eb7p li\u00ean t\u1ee5c \u1edf tr\u00ean c\u00e1c trang web.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u0110i\u1ec1u n\u00e0y g\u00e2y ra s\u1ef1 t\u1ed1n k\u00e9m v\u1ec1 th\u1eddi gian v\u00e0 c\u00f4ng s\u1ee9c, n\u00ean nh\u1edd s\u1ef1 thay \u0111\u1ed5i c\u1ee7a CSS c\u00f3 th\u1ec3 l\u00e0m cho m\u1ecdi vi\u1ec7c \u0111\u01b0\u1ee3c tr\u1edf n\u00ean g\u1ecdn g\u00e0ng, tr\u1eadt t\u1ef1. C\u00e1c n\u1ed9i dung c\u1ee7a trang web \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb d\u1ec5 nh\u00ecn v\u00e0 t\u00e1ch b\u1ea1ch h\u01a1n so v\u1edbi th\u1eddi \u0111i\u1ec3m ban \u0111\u1ea7u. B\u1edfi v\u00ec l\u00fd do \u0111\u00f3 m\u00e0 qu\u00e1 tr\u00ecnh c\u1eadp nh\u1eadt cho n\u1ed9i dung tr\u1edf n\u00ean d\u1ec5 d\u00e0ng v\u00e0 hi\u1ec7u qu\u1ea3, gi\u00fap h\u1ea1n ch\u1ebf \u0111\u1ebfn m\u1ee9c t\u1ed1i \u0111a vi\u1ec7c r\u1ed1i r\u1eafm cho m\u00e3 ngu\u1ed3n HTML.\u00a0<\/span><\/p>\n<p><em><strong>&gt;&gt;&gt; M\u1eddi c\u00e1c b\u1ea1n tham kh\u1ea3o th\u00eam:<\/strong> <a class=\"LinkSuggestion__Link-sc-1gewdgc-4 evyocv\" href=\"https:\/\/teky.edu.vn\/blog\/scss-la-gi\/\" target=\"_blank\" rel=\"noopener\">SCSS l\u00e0 g\u00ec? Nh\u1eefng \u0111i\u1ec1u c\u1ea7n bi\u1ebft v\u1ec1 SCSS, SASS?\u00a0<\/a><\/em><\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Phien_ban_CSS_cai_tien_ra_sao\"><\/span><b>Phi\u00ean b\u1ea3n CSS c\u1ea3i ti\u1ebfn ra sao?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">M\u1ecdi ng\u01b0\u1eddi th\u01b0\u1eddng th\u1ea5y r\u1eb1ng Z-index trong CSS \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t trong nh\u1eefng y\u1ebfu t\u1ed1 v\u00f4 c\u00f9ng quan tr\u1ecdng. Th\u1ef1c t\u1ebf, phi\u00ean b\u1ea3n ban \u0111\u1ea7u c\u1ee7a CSS ch\u1ec9 c\u00f3 nh\u1eefng \u0111\u1eb7c t\u00ednh c\u1ee5 th\u1ec3 nh\u01b0: ph\u00e2n lo\u1ea1i chung, nh\u1eadn d\u1ea1ng duy nh\u1ea5t, \u0111\u1ecbnh v\u1ecb c\u00e1c y\u1ebfu t\u1ed1 v\u00e0 c\u00e1c nh\u00f3m thu\u1ed9c t\u00ednh.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Tr\u1ea3i qua nhi\u1ec1u phi\u00ean b\u1ea3n, cho \u0111\u1ebfn nay \u0111\u00e3 c\u00f3 CSS4 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt v\u00e0 th\u1eeba k\u1ebf t\u1eeb nh\u1eefng ph\u01b0\u01a1ng th\u1ee9c tr\u01b0\u1edbc, ph\u00e1t tri\u1ec3n v\u00e0 d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c nhi\u1ec1u ph\u01b0\u01a1ng th\u1ee9c m\u1edbi th\u00eam v\u00e0o nh\u01b0 Mutability, Hyperlink\u2026 Ch\u00fang c\u00f3 th\u00eam nhi\u1ec1u b\u1ed9 ch\u1ecdn \u0111a d\u1ea1ng nh\u01b0 thu\u1ed9c t\u00ednh m\u1edbi, \u0111a d\u1ea1ng b\u1ed9 ch\u1ecdn, linh ho\u1ea1t tr\u00ecnh b\u00e0y b\u1ed1 c\u1ee5c v\u00e0 c\u00e1c trang ch\u1ea5t l\u01b0\u1ee3ng.<\/span><\/p>\n<figure id=\"attachment_8679\" aria-describedby=\"caption-attachment-8679\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8679\" src=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/08\/khac-phuc-nhung-van-de-cua-z-index-trong-css.jpg\" alt=\"Kh\u1eafc ph\u1ee5c nh\u1eefng v\u1ea5n \u0111\u1ec1 c\u1ee7a Z-index trong CSS\" width=\"650\" height=\"400\" srcset=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/08\/khac-phuc-nhung-van-de-cua-z-index-trong-css.jpg 650w, https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/08\/khac-phuc-nhung-van-de-cua-z-index-trong-css-400x246.jpg 400w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><figcaption id=\"caption-attachment-8679\" class=\"wp-caption-text\">Kh\u1eafc ph\u1ee5c nh\u1eefng v\u1ea5n \u0111\u1ec1 c\u1ee7a Z-index trong CSS<\/figcaption><\/figure>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Tr\u00ean \u0111\u00e2y l\u00e0 nh\u1eefng th\u00f4ng tin m\u00e0 ch\u00fang t\u00f4i cung c\u1ea5p cho b\u1ea1n \u0111\u1ecdc v\u1ec1 Z-index trong CSS, ngo\u00e0i ra chia s\u1ebb th\u00eam nh\u1eefng ki\u1ebfn th\u1ee9c kh\u00e1c v\u1ec1 CSS \u0111\u1ec3 b\u1ea1n c\u00f3 th\u1ec3 hi\u1ec3u v\u00e0 c\u00f3 \u0111\u01b0\u1ee3c s\u1ef1 l\u1ef1a ch\u1ecdn s\u1eed d\u1ee5ng ph\u00f9 h\u1ee3p. N\u1ebfu b\u1ea1n th\u1ea5y nh\u1eefng th\u00f4ng tin n\u00e0y b\u1ed5 \u00edch, h\u00e3y chia s\u1ebb gi\u00fap ch\u00fang t\u00f4i t\u1edbi nh\u1eefng ng\u01b0\u1eddi xung quanh \u0111\u1ec3 h\u1ecd c\u00f3 th\u1ec3 \u0111\u1ecdc v\u00e0 c\u00f3 \u0111\u01b0\u1ee3c s\u1ef1 l\u1ef1a ch\u1ecdn s\u1eed d\u1ee5ng ph\u1ea7n m\u1ec1m t\u1ed1i \u01b0u h\u01a1n nh\u00e9. Ngo\u00e0i ra, \u0111\u1eebng qu\u00ean \u0111\u1ecdc th\u00eam nh\u1eefng b\u00e0i vi\u1ebft kh\u00e1c tr\u00ean trang web Teky c\u1ee7a ch\u00fang t\u00f4i \u0111\u1ec3 tr\u1edf n\u00ean gi\u1ecfi giang h\u01a1n trong nhi\u1ec1u l\u0129nh v\u1ef1c IT. Gi\u1edbi thi\u1ec7u cho b\u1ea1n b\u00e0i vi\u1ebft v\u1ec1 <\/span><a href=\"https:\/\/teky.edu.vn\/blog\/jwt-la-gi\/\"><span style=\"font-weight: 400;\">JWT l\u00e0 g\u00ec<\/span><\/a><span style=\"font-weight: 400;\"> r\u1ea5t hay v\u00e0 th\u00fa v\u1ecb v\u1edbi l\u01b0\u1ee3ng t\u00ecm \u0111\u1ecdc r\u1ea5t cao, b\u1ea1n \u0111\u1eebng b\u1ecf qua nh\u00e9!<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Hoc_vien_cong_nghe_Teky_la_noi_hoc_lap_trinh_hang_dau_Viet_Nam\"><\/span><span style=\"font-size: 24px; color: #339966;\" data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;C\u00f9ng T\u00ecm Hi\u1ec3u V\u1ec1 Teky H\u1ecdc Vi\u1ec7n 5 sao \u0110\u00e0o T\u1ea1o Tr\u1ebb Em H\u1ecdc L\u1eadp Tr\u00ecnh (4-18 tu\u1ed5i)&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:17153,&quot;3&quot;:{&quot;1&quot;:0},&quot;11&quot;:4,&quot;12&quot;:0,&quot;17&quot;:1}\">H\u1ecdc vi\u1ec7n c\u00f4ng ngh\u1ec7 Teky l\u00e0 n\u01a1i h\u1ecdc l\u1eadp tr\u00ecnh h\u00e0ng \u0111\u1ea7u Vi\u1ec7t Nam<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><iframe loading=\"lazy\" title=\"H\u1ecdc l\u1eadp tr\u00ecnh tr\u1ebb em \u1edf \u0111\u00e2u? - Gi\u1edbi thi\u1ec7u h\u1ecdc vi\u1ec7n c\u00f4ng ngh\u1ec7 TEKY h\u00e0ng \u0111\u1ea7u Vi\u1ec7t Nam\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/kGgr0XJAxFM?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p><strong>TEKY l\u00e0 H\u1ecdc vi\u1ec7n s\u00e1ng t\u1ea1o c\u00f4ng ngh\u1ec7<\/strong> v\u1edbi ch\u01b0\u01a1ng tr\u00ecnh gi\u1ea3ng d\u1ea1y STEAM (Science \u2013 Technology \u2013 Engineering \u2013 Art \u2013 Mathematics) theo chu\u1ea9n M\u1ef9 \u0111\u1ea7u ti\u00ean t\u1ea1i Vi\u1ec7t Nam d\u00e0nh cho tr\u1ebb em t\u1eeb 4 \u0111\u1ebfn 18 tu\u1ed5i.<\/p>\n<p>\u0110\u01b0\u1ee3c th\u00e0nh l\u1eadp v\u00e0o th\u00e1ng 6 n\u0103m 2016, TEKY quy\u1ebft t\u00e2m th\u1ef1c hi\u1ec7n s\u1ee9 m\u1ec7nh mang \u0111\u1ebfn cho th\u1ebf h\u1ec7 tr\u1ebb Vi\u1ec7t Nam ki\u1ebfn th\u1ee9c to\u00e0n di\u1ec7n v\u1ec1 STEAM, \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c t\u01b0 duy c\u00f4ng ngh\u1ec7, khoa h\u1ecdc m\u00e1y t\u00ednh v\u00e0 k\u1ef9 n\u0103ng th\u1ebf k\u1ef7 21 \u2013 4Cs (Critical Thinking: T\u01b0 duy ph\u1ea3n bi\u1ec7n \u2013 Communication: Giao ti\u1ebfp \u2013 Creativity: S\u00e1ng t\u1ea1o \u2013 Collaboration: L\u00e0m vi\u1ec7c nh\u00f3m).<\/p>\n<figure id=\"attachment_14828\" aria-describedby=\"caption-attachment-14828\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/teky.edu.vn\/?utm_source=Blog&amp;utm_medium=baiviet\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-14828 size-full\" src=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/03\/Trai-nghiem-hoc-lap-trinh-mien-phi.jpg\" alt=\"Tr\u1ea3i nghi\u1ec7m h\u1ecdc l\u1eadp tr\u00ecnh mi\u1ec5n ph\u00ed\" width=\"600\" height=\"400\" srcset=\"https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/03\/Trai-nghiem-hoc-lap-trinh-mien-phi.jpg 600w, https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/03\/Trai-nghiem-hoc-lap-trinh-mien-phi-400x267.jpg 400w, https:\/\/teky.edu.vn\/blog\/wp-content\/uploads\/2021\/03\/Trai-nghiem-hoc-lap-trinh-mien-phi-272x182.jpg 272w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><figcaption id=\"caption-attachment-14828\" class=\"wp-caption-text\">Tr\u1ea3i nghi\u1ec7m h\u1ecdc l\u1eadp tr\u00ecnh mi\u1ec5n ph\u00ed<\/figcaption><\/figure>\n<h4><span class=\"ez-toc-section\" id=\"Day_la_chuong_trinh_khong_chi_trang_bi_kien_thuc_lap_trinh_ma_con_ren_luyen_nhom_ky_nang_4Cs_Tre_se_duoc\"><\/span>\u0110\u00e2y l\u00e0 ch\u01b0\u01a1ng tr\u00ecnh kh\u00f4ng ch\u1ec9 trang b\u1ecb ki\u1ebfn th\u1ee9c l\u1eadp tr\u00ecnh m\u00e0 c\u00f2n r\u00e8n luy\u1ec7n nh\u00f3m k\u1ef9 n\u0103ng 4Cs. Tr\u1ebb s\u1ebd \u0111\u01b0\u1ee3c:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li>\u00a0H\u1ecdc t\u01b0 duy ph\u1ea3n bi\u1ec7n th\u00f4ng qua vi\u1ec7c ph\u00e2n t\u00edch c\u00e1c v\u1ea5n \u0111\u1ec1.<\/li>\n<li>\u00a0H\u1ecdc t\u00ednh s\u00e1ng t\u1ea1o t\u01b0 duy Logic th\u00f4ng qua vi\u1ec7c l\u1eafp \u0111\u1eb7t v\u00e0 l\u1eadp tr\u00ecnh robot th \u00f4ng qua c\u00e1c m\u00f4 h\u00ecnh Lego Mindstorm, app tr\u00f2 ch\u01a1i. Gi\u00fap con h\u1ecdc gi\u1ecfi m\u00f4n To\u00e1n tr\u00ean l\u1edbp<\/li>\n<li>\u00a0K\u1ef9 n\u0103ng h\u1ee3p t\u00e1c th\u00f4ng qua c\u00e1c tr\u00f2 ch\u01a1i team-building, c\u00e1c d\u1ef1 \u00e1n nh\u00f3m tr\u00ean l\u1edbp.<\/li>\n<li>\u00a0Ph\u00e1t huy kh\u1ea3 n\u0103ng giao ti\u1ebfp hi\u1ec7u qu\u1ea3 b\u1eb1ng nhi\u1ec1u b\u00e0i t\u1eadp v\u00e0 ho\u1ea1t \u0111\u1ed9ng h\u1ea5p d\u1eabn.<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" title=\"Shark Nguy\u1ec5n Ho\u00e0 B\u00ecnh \u0111\u1ed3ng h\u00e0nh c\u00f9ng con h\u1ecdc l\u1eadp tr\u00ecnh t\u1ea1i h\u1ecdc vi\u1ec7n c\u00f4ng ngh\u1ec7 Teky h\u00e0ng \u0111\u1ea7u Vi\u1ec7t Nam\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/q6QbqIs6ll8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>C\u00e1c b\u1ed9 m\u00f4n gi\u1ea3ng d\u1ea1y t\u1ea1i Teky g\u1ed3m: <span style=\"font-weight: 400;\">L\u1eadp tr\u00ecnh v\u00e0 ph\u00e1t tri\u1ec3n \u1ee9ng d\u1ee5ng<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">l\u1eadp tr\u00ecnh game<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">l\u1eadp tr\u00ecnh web v\u1edbi python<\/span> <span style=\"font-weight: 400;\">\u00a0<\/span><span style=\"font-weight: 400;\">L\u1eadp tr\u00ecnh Scratch<\/span> <span style=\"font-weight: 400;\">Robotics<\/span> Engineering, C\u00f4ng ngh\u1ec7 3D v\u00e0 MultiMedia. Ch\u00fang t\u00f4i tin r\u1eb1ng tr\u1ebb em Vi\u1ec7t Nam c\u00f3 c\u01a1 h\u1ed9i ph\u00e1t tri\u1ec3n m\u1ea1nh m\u1ebd trong m\u1ed9t n\u1ec1n kinh t\u1ebf s\u1ed1 v\u00e0 c\u1ea7n \u0111\u01b0\u1ee3c trang b\u1ecb s\u1eb5n s\u00e0ng \u0111\u1ec3 tr\u1edf th\u00e0nh nh\u1eefng doanh nh\u00e2n c\u00f4ng ngh\u1ec7 trong t\u01b0\u01a1ng lai.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Lien_he_ngay_hoc_vien_cong_nghe_sang_tao_TEKY_de_duoc_tu_van_khoa_hoc\"><\/span><span style=\"color: #008000;\"><b>Li\u00ean h\u1ec7 ngay h\u1ecdc vi\u1ec7n c\u00f4ng ngh\u1ec7 s\u00e1ng t\u1ea1o TEKY \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n kh\u00f3a h\u1ecdc:<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cam k\u00eat 7 tu\u1ed5i c\u00f3 th\u1ec3 l\u1eadp tr\u00ecnh<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Top 10 d\u1ef1 \u00e1n gi\u00e1o d\u1ee5c c\u00f3 t\u1ea7m \u1ea3nh h\u01b0\u1edfng nh\u1ea5t \u0110\u00f4ng Nam \u00c1 2017 &amp; 2018<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Top 3 D\u1ef1 \u00e1n xu\u1ea5t s\u1eafc nh\u1ea5t, NextGen \u2013 Th\u1ee5y S\u0129<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u00a0Hotline H\u00e0 N\u1ed9i: 024-7109-6668 | 0975-241-015<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u00a0Hotline H\u1ed3 Ch\u00ed Minh: 028-7109 9948 | 097-900-8642<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Website <\/span><a href=\"https:\/\/teky.edu.vn\/\"><span style=\"font-weight: 400;\">https:\/\/teky.edu.vn<\/span><\/a><span style=\"font-weight: 400;\"> | Email: support@teky.edu.vn |<\/span><\/p>\n<p style=\"text-align: justify;\">\n","protected":false},"excerpt":{"rendered":"<p>C\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng, Z-index l\u00e0 m\u1ed9t thu\u1ed9c t\u00ednh \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u ng\u01b0\u1eddi quan t\u00e2m v\u00e0 mu\u1ed1n t\u00ecm hi\u1ec3u. N\u1ebfu nh\u01b0 b\u1ea1n c\u00f2n nhi\u1ec1u v\u1ea5n \u0111\u1ec1 ch\u01b0a bi\u1ebft v\u1ec1 thu\u1ed9c t\u00ednh Z-index trong CSS n\u00e0y, ngo\u00e0i ra mu\u1ed1n bi\u1ebft t\u01b0\u1eddng t\u1eadn nh\u1eefng \u01b0u \u0111i\u1ec3m c\u1ee7a Z-index css th\u00ec \u0111\u00e2y s\u1ebd l\u00e0 b\u00e0i vi\u1ebft m\u00e0 b\u1ea1n &hellip;<\/p>\n","protected":false},"author":10,"featured_media":8680,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"show_on_app":false,"footnotes":""},"categories":[28],"tags":[],"class_list":["post-8681","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lap-trinh"],"acf":{"show_on_app":false},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.9 (Yoast SEO v26.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Z-index trong CSS l\u00e0 g\u00ec? \u01afu \u0111i\u1ec3m c\u1ee7a ch\u00fang l\u00e0 g\u00ec?<\/title>\n<meta name=\"description\" content=\"N\u1ebfu nh\u01b0 b\u1ea1n c\u00f2n nhi\u1ec1u v\u1ea5n \u0111\u1ec1 ch\u01b0a bi\u1ebft v\u1ec1 thu\u1ed9c t\u00ednh Z-index trong CSS n\u00e0y, h\u00e3y \u0111\u1ecdc ti\u1ebfp b\u00e0i vi\u1ebft \u0111\u1ec3 c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u \u0111\u01b0\u1ee3c nhi\u1ec1u h\u01a1n n\u1eefa nh\u00e9.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/teky.edu.vn\/blog\/z-index-trong-css\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Z-index trong CSS l\u00e0 g\u00ec? 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