准备

创建元素

<div class="parent"> <div class="child">child</div></div>

垂直水平居中方案一：知道宽度的情况下 absolute+margin负值

.parent { width:400px; height:400px; background: red; position: relative;}.child { position: absolute; left:50%; top:50%; background: yellow; width:50px; height:50px; margin-left:-25px; margin-top:-25px;}

垂直水平居中方案二：不知道宽高的情况下 absolute+transform

.parent { width:400px; height:400px; background: red; position: relative;}.child { position: absolute; left:50%; top:50%; transform: translate(-50%,-50%);}

垂直居中方案三：position+margin:auto

.parent { position:relative; width:200px; height:200px; background: red;}.child { width:80px; height:40px; background: yellow; position: absolute; left:0; top:0; right:0 ; bottom:0; margin:auto;}

垂直居中方案四：+ 多行文本的垂直居中 :table-cell+vertical-align:middle;

.parent { height: 300px; width:400px; border: 1px solid red; display: table-cell; vertical-align: middle; text-align: center;}.child { display: inline-block; width:50px; height:50px; background: blue;}.parent { width: 400px; height: 300px; display: table-cell; vertical-align: middle; border: 1px solid red; text-align: center;}.child { display: inline-block; vertical-align: middle; background: blue;}

垂直居中方案五：display: flex

.parent { width:400px; height:200px; background:red; display: flex; justify-content:center; align-items:center;}.child { height:100px; width:100px; background:green;}

垂直居中方案六：伪元素

.parent { width:200px; height:200px; background:red; text-align: center;}.child { height:100px; width:100px; background:yellow; display: inline-block; vertical-align: middle;}.parent:before { content:""; height:100%; vertical-align: middle; display: inline-block;}

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