<!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>111cn.net</title>
<style type=”text/”>
<!–
div {
position:absolute;
top:50%;
left:50%;
margin:-150px 0 0 -200px;
width:400px;
height:300px;
border:1px solid red;
}
–>
</style>
</head>
<body>
<div>111cn.net- div css布局 常见问题</div>
</body>
</html>
