css div垂直居中

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>无标题文档</title>

<style type="text/css">

.main{

    position:absolute;

    top:%;

    left:%;

    width:200px;

    height:100px;

    margin-top:-50px;

    margin-left:-100px;

    border:1px solid red;

    line-height:30px;

    font-size:16px;

    text-align:center;

    }

</style>

</head>

<body>

<div class="main">王锋老师博客:http://blog.sina.com/wangfengteacher</div>

</body>

</html>
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css div垂直居中

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