code 1:
HTML code:
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html>
<meta http-equiv="Content-Type" content="text/html;" charset="gb2312"></meta>
<head>
</head>
<style>
#top_outer{
width:100%;
height:20px;
background:#EDF2F6;
}
#page_outer{
width:100%;
height:400px;
background:#EDF2F6;
border:1px solid red;
}
#mainContent{
border:1px solid red;
margin-top:50px;
margin-left:50%;
width:50%;
height:200px;/**/
}
</style>
<body>
<div id="top_outer">
</div>
<div id="page_outer">
<div id="mainContent">
</div>
</div>
</body>
</html>
code2:
HTML code:
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html>
<meta http-equiv="Content-Type" content="text/html;" charset="gb2312"></meta>
<head>
<title>登录</title>
