#tent{margin:0 0 0 2%;positioive;}
<div class="tent-tainer"><fieldset>
<!--
background-color:#555555;}
<!doctype html public "-//w3c//dtd xhtml 1.0 strict//en" "3./tr/xhtml1/dtd/xhtml1-strict.dtd">
-->
<body>
<html xmlns="3./1999/xhtml">
<title>500 - ?</title>
<div id="tent">
</div>
<style type="text/css">
<head>
<div id="header"><h1></h1></div>
<h2>500 - ?</h2>
<meta http-equiv="tent-type" tent="text/html; charset=gb2312"/>
<h3>?????</h3>
#header{width:96%;margin:0 0 0 0;padding:6px 2% 6px 2%;font-family:"trebuchet ms", verdana, sans-serif;color:#fff;
h2{font-size:1.7em;margin:0;color:#cc0000;}
h1{font-size:2.4em;margin:0;color:#fff;}
body{margin:0;font-size:.7em;font-family:verdana, arial, helvetica, sans-serif;background:#eeeeee;}
h3{font-size:1.2em;margin:10px 0 0 0;color:#000000;}
</fieldset></div>
.tent-tainer{background:#fff;width:96%;margin-top:8px;padding:10px;positioive;}
</head>
</style>
fieldset{padding:0 15px 10px 15px;}