假设高度已知，请写出三栏布局，其中左右各为300px 中间自适用

<!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>Document</title>
    <style>
        html * {
            margin: 0;
            padding: 0;
        }
        
        div {
            min-height: 100px;
            text-align: center;
        }
        
        .mt20 {
            margin-top: 20px;
        }
        
        .layout .left {
            float: left;
            background: yellow;
            width: 300px;
        }
        
        .layout .right {
            float: right;
            width: 300px;
            background: blue;
        }
        
        .layout .center {
            background: red;
        }
        
        .absolute .left {
            position: absolute;
            width: 300px;
            background: yellow;
            left: 0px;
        }
        
        .absolute .right {
            position: absolute;
            width: 300px;
            background: blue;
            right: 0px;
        }
        
        .absolute .center {
            margin: 0 300px;
            background: red;
        }
        
        .flexbox {
            display: flex;
        }
        
        .flexbox .left {
            width: 300px;
            background: yellow;
        }
        
        .flexbox .right {
            width: 300px;
            background: blue;
        }
        
        .flexbox .center {
            background: red;
            flex: 1;
        }
        
        .table {
            display: table;
            width: 100%;
            height: 100px;
        }
        
        .table div {
            display: table-cell;
        }
        
        .table .left {
            width: 300px;
            background: yellow;
        }
        
        .table .right {
            width: 300px;
            background: blue;
        }
        
        .table .center {
            background: red;
        }
        
        .grid {
            display: grid;
            width: 100%;
            grid-template-rows: 100px;
            grid-template-columns: 300px auto 300px;
            /*三个值代表三列第一列300px 中间自适用 右边300px 每列宽*/
        }
        
        .grid .left {
            background: yellow;
        }
        
        .grid .right {
            background: blue;
        }
        
        .grid .center {
            background: red;
        }
    </style>


    <body>

        <section class="layout">
            <div class="left"></div>
            <div class="right"></div>
            <div class="center">
                <h1>浮动方案</h1>
            </div>
        </section>
        <section class="absolute mt20">
            <div class="left"></div>
            <div class="right"></div>
            <div class="center">
                <h1>绝对定位方案</h1>
            </div>
        </section>
        <section class="flexbox mt20">
            <div class="left"></div>
            <div class="center">
                <h1>flex布局方案</h1>
            </div>
            <div class="right"></div>
        </section>

        <section class="table mt20">
            <div class="left"></div>
            <div class="center">
                <h1>table布局方案</h1>
            </div>
            <div class="right"></div>
        </section>
        <section class="grid mt20">
            <div class="left"></div>
            <div class="center">
                <h1>grid布局方案</h1>
            </div>
            <div class="right"></div>
        </section>
    </body>

</html>
假设高度已知，请写出三栏布局，其中左右各为300px 中间自适用

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