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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Vertical centering in valid CSS</title>
<style type="text/css">
body {padding: 0; margin: 0; font-size: 75%; line-height: 140%; font-family:Arial, Helvetica, sans-serif;}
body,html{height: 100%; }
a{color: #333;}
a:hover{color: green;}
#outer {height: 100%; overflow: hidden; position: relative;width: 100%; background:ivory; }
#outer[id] {display: table; position: static;}
#middle {position: absolute; top: 50%;text-align:center;} /* for explorer only*/
#middle[id] {display: table-cell; vertical-align: middle; position: static;}
#inner {position: relative; top: -50%;width: 600px;margin: 0 auto;text-align:left;}/*for explorer only */
div.greenBorder {border: 1px solid green; background-color: #FFF;}
p{margin: 1em;}
</style>
</head>
<body>
<div id="outer">
<div id="middle">
<div id="inner" class="greenBorder">
<table><tr><td>我就喜欢在中间</td></tr></table>
</div>
</div>
</div>
</body>
</html>