我直接写了个案例，先看下效果图： 下面是html代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>机构动态</title>
<style type="text/css">
*{
margin:0px;
padding:0px;
}
.test_m ul {
margin: 20px;
width: 630px;
overflow:hidden;
border-top:1px solid black;
}
.test_m ul li{
padding: 10px 20px 11px 20px;
box-sizing: border-box;
float: left;
width: 315px;
height: 111px;
list-style: none;
}
.test_m ul li:nth-child(2n+1){
border:1px solid black;
border-top:0;
}
.test_m ul li:nth-child(2n){
border-bottom:1px solid black;
border-right:1px solid black;
}
</style>
</head>
<body>
<div class="test_m">
<ul>
<li>
菜单1
</li>
<li>
菜单2
</li>
<li>
菜单3
</li>
<li>
菜单4
</li>
</ul>
</div>
</body>
</html>
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