给导航添加边框
实例代码；
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style>
ul{
list-style-type:none;
margin:0;
padding:0;
}
a.active{
background-color:green;
}
li a {
background-color:#cccccc;
width:100px;
display:block;
padding:8px 16px;
text-decoration:none;
border:1px solid black;
}
li a:hover{
background-color:#555;
color:white;
}
</style>
</head>
<body>
<h1>给导航添加边框</h1>
<p>在此例中，我们创建一个具有边框的导航链接</p>
<ul>
<li><a class="active "href="https://www.dwoke.com">首页</a></li>
<li><a href="https://www.dwoke.com">文章</a></li>
<li><a href="https://www.dwoke.com">下载</a></li>
<li><a href="https://www.dwoke.com">文档</a></li>
<li><a href="https://www.dwoke.com">关于</a></li>
</ul>
</body>
</html>
运行效果：
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