What is the common reason why content_shop cannot be displayed on the browser? The code is the same as yours-PHP Chinese Network Q&A

<!DOCTYPE html>

<html>

<head>

</head>

<body>

</div>

</div>

</body>

</html>

css：

*{margin:0px;padding:0px;}

a{text-decoration: none;}

.header{width:100%;height: 40px;background:#333;}

.content_top{width: 100%; margin-bottom: 10px;}

.content_bottom{width: 100%;height:500px;background: #ccc;}

.footer_top{width: 100%;height: 100px;}

.footer_bottom{width: 100%;height:100px;background: #ccc;}

.content{width: 1226px;margin: 0px auto;}

.content_menu{width:1226px;height: 90px;background: pink;margin: 10px auto;}

.content_pic{width:1226px;height: 460px;background: url(../img/mi.jpg);}

.content_shop{width: 1226px;height:170;}

.content_shop_1{width:200px;height: 170;background: #ccc;float:left;margin-right: 10px;}

.content_shop_2{width:316px;height: 170;background: #ccc;float:left;margin-right: 10px;}

.content_shop_3{width:316px;height: 170;background: #ccc;float:left;margin-right: 10px;}

.content_shop_4{width:316px;height: 170;background: #ccc;}