跟着老师写的，为什么只有一个边框，别的都没显示啊···
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<link type="text/css" rel="stylesheet" href="css/style.css">
</head>
<body>
<div id="notice">
<div id="notice-tit">
<ul>
<li>
<a href="#">公告</a>
<a href="#">规则</a>
<a href="#">论坛</a>
<a href="#">安全</a>
<a href="#">公益</a>
</li>
</ul>
</div>
</div>
</body>
</html>
