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				|  |  | +<!DOCTYPE html>
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				|  |  | +<html lang="en">
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				|  |  | +<head>
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				|  |  | +    <meta charset="UTF-8">
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				|  |  | +    <meta name="viewport" content="width=device-width, initial-scale=1.0">
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				|  |  | +    <title>Document</title>
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				|  |  | +    <style>
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				|  |  | +        * {
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				|  |  | +            margin: 0;
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				|  |  | +            padding: 0;
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				|  |  | +        }
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				|  |  | +        h3 {
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				|  |  | +            width: 100%;
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				|  |  | +            height: 50px;
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				|  |  | +            font-size: 24px;
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				|  |  | +            font-weight: bold;
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				|  |  | +            line-height: 50px;
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				|  |  | +            text-align: center;
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				|  |  | +            background: #ccc;
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				|  |  | +            margin-bottom: 10px;
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				|  |  | +        }
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				|  |  | +        #imgBox {
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				|  |  | +            width: 100%;
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				|  |  | +            height: 300px;
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				|  |  | +            background: url('./images/3.jpg') no-repeat;
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				|  |  | +            background-position: center;
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				|  |  | +        }
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				|  |  | +        #main {
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				|  |  | +            width: 100%;
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				|  |  | +            margin: 10px auto;
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				|  |  | +        }
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				|  |  | +        .sideBar {
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				|  |  | +            width: 100%;
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				|  |  | +            height: 200px;
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				|  |  | +            background: #0f0;
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				|  |  | +        }
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				|  |  | +
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				|  |  | +        .container {
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				|  |  | +            width: 100%;
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				|  |  | +            height: 200px;
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				|  |  | +            background: plum;
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				|  |  | +        }
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				|  |  | +        @media screen and (min-width:480px) {
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				|  |  | +        #imgBox {
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				|  |  | +            width: 100%;
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				|  |  | +            height: 500px;
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				|  |  | +            background: url('./images/1.jpg') no-repeat;
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				|  |  | +            background-position: center;
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				|  |  | +        }
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				|  |  | +        #main {
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				|  |  | +            width: 100%;
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				|  |  | +            margin: 10px auto;
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				|  |  | +            overflow: hidden;
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				|  |  | +        }
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				|  |  | +        .sideBar {
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				|  |  | +            width: 65vw;
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				|  |  | +            height: 200px;
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				|  |  | +            background: #0f0;
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				|  |  | +            float: left;
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				|  |  | +        }
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				|  |  | +
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				|  |  | +        .container {
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				|  |  | +            width: 30vw;
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				|  |  | +            height: 200px;
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				|  |  | +            background: plum;
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				|  |  | +            float: right;
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				|  |  | +        }
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				|  |  | +
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				|  |  | +        }
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				|  |  | +        @media screen and (min-width:960px) {
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				|  |  | +        #imgBox {
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				|  |  | +            width: 100%;
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				|  |  | +            height: 600px;
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				|  |  | +            background: url('./images/2.jpg') no-repeat;
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				|  |  | +            background-position: center;
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				|  |  | +            background-size: cover;
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				|  |  | +        }
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				|  |  | +        #main {
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				|  |  | +            width: 100%;
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				|  |  | +            margin: 25px auto;
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				|  |  | +            overflow: hidden;
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				|  |  | +        }
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				|  |  | +        .sideBar {
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				|  |  | +            width: 65vw;
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				|  |  | +            height: 200px;
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				|  |  | +            background: #ff0;
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				|  |  | +            float: left;
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				|  |  | +        }
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				|  |  | +
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				|  |  | +        .container {
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				|  |  | +            width: 30vw;
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				|  |  | +            height: 200px;
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				|  |  | +            background: plum;
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				|  |  | +            float: right;
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				|  |  | +        }
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				|  |  | +
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				|  |  | +        }
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				|  |  | +    </style>
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				|  |  | +</head>
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				|  |  | +<body>
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				|  |  | +    <h3>页眉</h3>
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				|  |  | +    <h3>导航</h3>
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				|  |  | +    <div id="imgBox"></div>
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				|  |  | +    <div id="main">
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				|  |  | +        <div class="sideBar"></div>
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				|  |  | +        <div class="container"></div>
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				|  |  | +    </div>
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				|  |  | +    <h3>页尾</h3>
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				|  |  | +</body>
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				|  |  | +</html>
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