居中一直是CSS中被抱怨的典型。為什麼實現起來這麼辛苦？所以有人被嘲笑。我覺得問題不是沒有辦法做到，只是視情況而定，有很多不同方式，但很難弄清楚應該用何種方式。
因此我寫了這篇文章，希望能把他變得容易點。
水平居中
內聯元素（inline or inline-*）居中?
你可以讓他相對父級塊級元素居中對齊
.center-children { text-align: center; }
塊級元素（block level）居中?
margin-left和margin-right為auto讓它居中（同時還要設定width，否則它就會承滿整個容器，無法看出居中效果），如。.center-me { margin: 0 auto; }
body { background: #f06d06; font-size: 80%; } main { background: white; margin: 20px 0; padding: 10px; } main div { background: black; color: white; padding: 15px; max-width: 125px; margin: 5px; } .inline-block-center { text-align: center; } .inline-block-center div { display: inline-block; text-align: left; } .flex-center { display: flex; justify-content: center; }
.link { padding-top: 30px; padding-bottom: 30px; }
.center-text-trick { height: 100px; line-height: 100px; white-space: nowrap; }
| I'm vertically centered multiple lines of text in a real table cell. |
I'm vertically centered multiple lines of text in a CSS-created table layout.
body { background: #f06d06; font-size: 80%; } table { background: white; width: 240px; border-collapse: separate; margin: 20px; height: 250px; } table td { background: black; color: white; padding: 20px; border: 10px solid white; /* default is vertical-align: middle; */ } .center-table { display: table; height: 250px; background: white; width: 240px; margin: 20px; } .center-table p { display: table-cell; margin: 0; background: black; color: white; padding: 20px; border: 10px solid white; vertical-align: middle; }
.parent { position: relative; } .child { position: absolute; top: 50%; height: 100px; margin-top: -50px; /* 如果没有使用: border-box; 的盒子模型则需要设置这个 */ }
.parent { position: relative; } .child { position: absolute; top: 50%; transform: translateY(-50%); }
body { background: #f06d06; font-size: 80%; } main { background: white; height: 300px; width: 200px; padding: 20px; margin: 20px; display: flex; flex-direction: column; justify-content: center; resize: vertical; overflow: auto; } main div { background: black; color: white; padding: 20px; resize: vertical; overflow: auto; }
.parent { position: relative; } .child { width: 300px; height: 100px; padding: 20px; position: absolute; top: 50%; left: 50%; margin: -70px 0 0 -170px; }
.parent { position: relative; } .child { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); }
