题目描述 ：
使用HTML+CSS实现如图布局，border-width:5px，格子大小是50px*50px，hover时
边框变成红色，需要考虑语义化。
方法一：利用box-shadow
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document
</title>
<style type="text/css">
* {
margin: 0;padding: 0;
}
.container {
list-style: none;
width: 170px;height: 170px;
padding-top: 5px;padding-right: 5px;
background: blue;
box-sizing: border-box;
}
.box {
float: left;
width: 50px;height: 50px;text-align: center;line-height: 50px;cursor: pointer;
background-color: white;
margin-left: 5px;margin-bottom: 5px;
}
li.box:hover {
box-shadow: 0 0 0 5px red;
}
</style>
</head>
<body>
<ul class="container">
<li class="box">1
</li>
<li class="box">2
</li>
<li class="box">3
</li>
<li class="box">4
</li>
<li class="box">5
</li>
<li class="box">6
</li>
<li class="box">7
</li>
<li class="box">8
</li>
<li class="box">9
</li>
</ul>
</body>
</html>
方法二：利用outline
li.box:hover {
outline: 5px solid red;
}
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