小用 flex布局

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>layout</title>
    <style>
        body{
            margin:0;
        }
        header{
            background-color: #36a032;
            height:80px;
        }
        body>div{
            background-color: #854b91;
        }
        body>div>*{
            /*background-color: #3815a0;*/
            width:33.333%;
            height:840px;
            float:left;
        }
        #header{
            height:20%;
            background-color: #3895a9;
            width:100%;
        }
        #middle{
            background-color: #c9ec87;
            display:flex;
            flex-wrap:wrap;
            align-content:flex-start;
        }
        #middle>aside{
            width:50%;
            height:70%;
            float:left;
        }
        #middle>aside:first-of-type{
            background-color: #58404e;
        }
        #middle>aside:last-of-type{
            background-color: #ba6bce;
        }
        body>div::after{
            content:'.';
            display:block;
            visibility:hidden;
            height:0;
            clear:left;
        }
        #footer{
            background-color: #a895a0;
            height:10%;
            width:100%;
        }
        aside{
            background-color: #38e5a0;
        }
        footer{
            background-color: #389520;
            height:60px;
        }
    </style>
</head>
<body>
    <header></header>
    <div>
        <aside id="left"></aside>
        <div id="middle">
            <div id="header"></div>
            <aside></aside>
            <aside></aside>
            <div id="footer"></div>
        </div>
        <aside id='right'></aside>
    </div>
    <footer></footer>
</body>
</html>

把中间的div 使用 flex 布局实现注意代码与 float实现时的不同 flex布局比较复杂属性较多，要用熟悉比较要通过一定量的练习才行

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