[html] 写一个左中右的满屏布局，左右固定220px,中间自适应并且要优先加载

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>test transform</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }
        .main {
            position: relative;
        }
        .center {
            position: absolute;
            box-sizing: border-box;
            width: 100%;
            padding: 0 220px;
            overflow: hidden;
        }
        .inner {
            height: 100px;
            background-color: silver;
        }
        .fl {
            float: left;
        }
        .fr {
            float: right;
        }
        .fl,
        .fr {
            width: 220px;
            height: 100px;
        }
        .left {
            background-color: red;
        }
        .right {
            background-color: black;
        }
        .clearfix::after {
            display: block;
            content: '';
            clear: both;
            height: 0;
            visibility: hidden;
        }
    </style>
</head>
<body>
    <div class="main clearfix">
        <div class="center">
            <div class="inner">测试测试测试测试测试测试测试测试测试测试测试</div>
        </div>
        <div class="left fl"></div>
        <div class="right fr"></div>
    </div>
</body>
</html>

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