<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<title>css实现九宫格</title>
<style type="text/css">
.box{width:333px;}
.box div{
width:100px;height:100px;border:3px solid blue;float:left;background: green;
margin-left:-3px;
margin-top:-3px;
}
.box div:hover{
position: relative;
border-color:red;
z-index: 100;
}
</style>
</head>
<body>
<div id="wrap">
<div class="box">
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>
</div>
</body>
</html>
