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代码在下面
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>backweb</title>
<link rel="stylesheet" href="css/bootstrap.min.css">
<style type="text/css">
#kuang{
width: 270px;/*宽度*/
height: 213px;/*高度*/
background:#E3E3E3;
margin: 50px auto;
}
</style>
</head>
<body background="beijing.jpg"></body>
<body>
<form>
<fieldset id="kuang">
<legend>登陆成功</legend>
<div class="header">
<img src="defaultAvatar.jpg" width="100px">
<div class="userInformation">
<span>用户信息</span>
</div>
<a href="logina.html"><button type="button" value="退出登录">退出登录</button></a>
</fieldset>
</form>
</body>
</html>
