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<html>
<head>
<title>login</title>
<style>
#outGround{
width:800;
height:500;
background-color:gray;
margin:0 auto;
}
</style>
</head>
<body>
<div id = "outGround">
</div>
</div>
</body>
</html>
<!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>
<title>login</title>
<style>
#outGround{
width:800px;
height:500px;
background-color:gray;
margin:0 auto;
}
</style>
</head>
<body>
<div id = "outGround">
</div>
</div>
</body>
</html>
body{text-align:center;}
<!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>
<style type="text/css">
#outGround{
width:800px; /**/
background-color:gray;
margin:0 auto;
}
</style>
</head>
<body>
<div id = "outGround">
测试测试测试测试测试测试测试测试测试测试测试
</div>
</body>
</html>