<!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>水平垂直居中DIV</title>
<style type="text/css">
body, div, form, img, ul, li {
font-family: "Tahoma";
margin: 0;
padding: 0;
border: 0;
list-style-type: none;
}
.all {
width:100%;
}
.all ul {
position:absolute;
top:50%;
left:50%;
margin-top:-150px;
margin-left:-300px;
width:600px;
height:300px;
background-color:#666;
}
.all ul li {
line-height: 50px;
text-align:center;
vertical-align:middle;
background-color:#CCC
}
</style>
</head>
<body>
<div class="all">
<ul>
<li>水平垂直居中DIV</li>
</ul>
</div>
</body>
</html>
这里注意两个地方
position:absolute(绝对定位)
line-height: 50px;(只有定义了line-height文字vertical-align 才能生效的)