lovecoding
/
VIP28


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    h3 {
      width: 960px;
      height: 50px;
      background: #cccccc;
      text-align: center;
      line-height: 50px;
      margin: 0 auto 10px;
    }

    #imgBox {
      width: 960px;
      height: 550px;
      background: url(img/1.jpg) 0 0 no-repeat;
      background-size: 100% 100%;
      margin: 0 auto;
    }

    #content {
      width: 960px;
      margin: 10px auto;
      overflow: hidden;
    }

    #left {
      width: 630px;
      height: 300px;
      background: red;
      float: left;
    }

    #right {
      width: 300px;
      height: 300px;
      background: blue;
      float: right;
    }

    @media screen and (max-width: 960px) {
      h3 {
        width: 100%;
      }

      #imgBox {
        width: 100%;
        background-image:  url(img/2.jpg);
        padding-top: 56%;
        height: 0;
        /* background-size: cover; */
        /* 
        960  540 
        100  56%
        */
      }

      #content {
        width: 100%;
      }

      #left {
        width: 65%;
      }

      #right {
        width: 33%;
      }
    }
    @media screen and (max-width: 480px) {
      #left{
        width: 100%;
      }
      #right{
        width: 100%;
      }
      #imgBox{
        background-image: url(img/3.jpg);
      }
    }
  </style>
</head>

<body>
  <h3>页眉</h3>
  <h3>导航</h3>
  <div id="imgBox"></div>
  <div id="content">
    <div id="left"></div>
    <div id="right"></div>
  </div>
  <h3>页脚</h3>
</body>

</html>