<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
.outer{
background-color: #f40;
}
.item{
width: 180px;
height: 150px;
background-color: #303a40;
border: 1px solid red;
}
.left{
float: left;
}
.clearfix:after{
content: "clear";
clear: both;
display: block;
visibility: hidden;
height: 0;
}
</style>
</head>
<body>
<div class="outer clearfix">
<div class="item left"></div>
<div class="item left"></div>
<div class="item left"></div>
<div class="item left"></div>
<div class="item left"></div>
<div class="item left"></div>
<!--<div id="" style="clear: both;"></div>-->
</div>
</body>
</html>
