trycss_cent_2 在线代码实例

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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>编程狮(w3cschool.cn)</title>
<style>
<style type="text/css">
    body {
      margin:0;padding:0
    }
    div {
      width:500px;
      height:500px;
      line-height:500px;
      border:1px solid #666;
      overflow:hidden;
      position:relative;
      text-align:center;
    }
    div p {
      position:static;
      +position:absolute;
      top:50%
    }
    img {
      position:static;
      +position:relative;
      top:-50%;left:-50%;
      vertical-align:middle
    }
    p:after {
      content:".";font-size:1px;
      visibility:hidden
    }
</style>
<body>
 
 
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运行结果
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