<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>盒子垂直水平居中</title>
<style>
body{
background-color: #ccc;
margin:0;
padding: 0;
}
.test{
width: 150px;
height: 75px;
border: 1px solid black;
position: absolute;
top: 50%;
left: 50%;
margin-left: -75px;
margin-top: -37.5px;
}
</style>
</head>
<body>
<div class="test">
盒子水平居中测试
</div>
</body>
</html>
原文：http://www.cnblogs.com/goldWen90/p/5092437.html