是这样的
<!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=gb2312" />
<title>无标题文档</title>
</head>
<style type="text/css">
.text{width:200px; height:100px; border:1px solid #FF0000; margin:10px 15px;}
</style>
<body>
<div class="text">helloworld!</div>
</body>
</html>
