请老师检查一下代码是否需要修改

来源：2-14 编程练习

慕桂英2021900

2019-08-01 10:54:01

<!DOCTYPE html>
<html>
<head>
   <meta charset="UTF-8">
   <title>Document</title>
   <style type="text/css">
       body{margin: 0;padding: 0;}
       .overall{
           width: 1200px;
           height: 600px;
           margin: 0 auto;
           margin-top: 50px;
       }
       .top{
           width: 1200px;
           height: 400px;
           background: #add8e6;
           overflow: hidden;
           padding: 0 20px;
       }
       .top1{
           width: 50%;
           height: 400px;
           float: left;
           background: url(http://climg.mukewang.com/58c0f808000129a303600215.jpg) center no-repeat;
           background-size: 560px 80%;
       }
       .top2{
           width: 50%;
           height: 400px;
           float: right;
           background: url(http://climg.mukewang.com/58c0f819000198a703600214.jpg) center no-repeat;
           background-size: 560px 80%;
       }
       .bottom{
           width: 1200px;
           height: 200px;
           background: #FF9999 ;
           padding: 0 20px;
       }
       .bottom .bottom1{
           width: 400px;
           height: 200px;
           float: left;
           background: url(http://climg.mukewang.com/58c0f81d0001fe4402000060.jpg) center no-repeat;
           background-size: 360px 80%;
       }
       .bottom .bottom2{
           width: 400px;
           height: 200px;
           float: left;
           background: url(http://climg.mukewang.com/58c0f8220001dfce02000060.jpg) center no-repeat;
           background-size: 360px 80%;
       }
       .bottom .bottom3{
           width: 400px;
           height: 200px;
           float: left;
           background: url(http://climg.mukewang.com/58c0f8780001c74602000060.jpg) center no-repeat;
           background-size: 360px 80%;
       }
   </style>
</head>
<body>
   <div class="overall">
       <div class="top">
           <div class="top1"></div>
           <div class="top2"></div>
       </div>
       <div class="bottom">
           <div class="bottom1"></div>
           <div class="bottom2"></div>
           <div class="bottom3"></div>
       </div>
   </div>
</body>
</html>