.tent-tainer{background:#fff;width:96%;margin-top:8px;padding:10px;positioive;}
-->
</style>
</head>
<body>
<div id="header"><h1></h1></div>
<div id="tent">
<div class="tent-tainer"><fieldset>
<h2>500 - ?</h2>
<h3>?????</h3>
</fieldset></div>
</div>
</body>
</html>
https://xianzhe.cc/book/62503/23037396_2.html