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?
你可以通過設定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; }
如果有許多塊級元素呢?
如果你有很勻塊級元素需要水平居中成一行,你最好使用一個不同的display類型。這是一個使用inline-block和flex的例子。
線上範例: http://jsfiddle.net/ourjs/0b6b7wt8/
<main class="inline-block-center"> <div> I'm an element that is block-like with my siblings and we're centered in a row. </div> <div> I'm an element that is block-like with my siblings and we're centered in a row. I have more content in me than my siblings do. </div> <div> I'm an element that is block-like with my siblings and we're centered in a row. </div> </main>
<main class="flex-center"> <div> I'm an element that is block-like with my siblings and we're centered in a row. </div> <div> I'm an element that is block-like with my siblings and we're centered in a row. I have more content in me than my siblings do. </div> <div> I'm an element that is block-like with my siblings and we're centered in a row. </div> </main> 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; }
垂直居中
㟎 〜〜(〜〜」中有點長,像文本和連結那樣的? 它是一行的嗎? 有時侯元素可以表現像垂直居中,只是因為它們有相等的上下padding.link { padding-top: 30px; padding-bottom: 30px; }
.center-text-trick { height: 100px; line-height: 100px; white-space: nowrap; }
<table> <tr> <td> I'm vertically centered multiple lines of text in a real table cell. </td> </tr> </table> <div class="center-table"> <p>I'm vertically centered multiple lines of text in a CSS-created table layout.</p> </div>
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 */ }
『 ://jsfiddle.net/ourjs/9sLf7p56/
.parent { position: relative; } .child { position: absolute; top: 50%; transform: translateY(-50%); }
你可以使用flexbox嗎?
這並不奇怪,使用flexbox會容易非常多
<main> <div> I'm a block-level element with an unknown height, centered vertically within my parent. </div> </main>
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; }
同時水平和垂直居中
元素有固定的寬度和高度
如果元素的寬度和高度是固定的寬度移和左移50%的寬度即可,此方案有極佳的跨瀏覽器支援。
.parent { position: relative; } .child { width: 300px; height: 100px; padding: 20px; position: absolute; top: 50%; left: 50%; margin: -70px 0 0 -170px; }
元素的宽度高度未知
如果你不知道高度和宽度(可变的),你可以使用transofrm属性在两个方向都平移负50%
.parent { position: relative; } .child { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); }