2-13 帮我看看？老师谢谢

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title></title>
  <style type="text/css">
  ul,li,body,img,div{
    padding: 0;
    margin:0;
  }
    .container{
        width:90%;
        height:600px;
        margin:0 auto;
    }
    .imgtop{
        width:100%;
        height:400px;
        background-color:skyblue;
    }
    .imgtop .bigimg{
      width: 50%;
      height: 400px;
      float: left;
      text-align: center;

    }
    .imgtop .bigimg img{
      position: relative;
      top:calc(50% - 107px);
    }
    .smallimg ul li{
      width: 100%;
      height: 200px;
      background-color: pink;
      float: left;
      list-style: none;
      width: calc(100% / 3);
      text-align: center;
     
    }
    .smallimg img{
      position: relative;
      top:calc(50% - 15px);
    }
  </style>
</head>
<body>
<div class="container">
  <div class="imgtop">
      <div class="bigimg">
        <img src="http://img1.sycdn.imooc.com/climg//58c0f808000129a303600215.jpg" alt="">
      </div>
      <div class="bigimg">
        <img src="http://img1.sycdn.imooc.com/climg//58c0f819000198a703600214.jpg" alt="">
      </div>
  </div>

  <div class="smallimg">
    <ul>
      <li><img src="http://img1.sycdn.imooc.com/climg//58c0f81d0001fe4402000060.jpg" alt=""></li>
      <li><img src="http://img1.sycdn.imooc.com/climg//58c0f8220001dfce02000060.jpg" alt=""></li>
      <li><img src="http://img1.sycdn.imooc.com/climg//58c0f8780001c74602000060.jpg" alt=""></li>
    </ul> 
  </div>
</div>
</body>
</html>

Mr丶Zhang小 2018-02-02

源自：CSS网页布局基础 2-14 编程练习