css Position 上下左中右布局

<!DOCTYPE html>
<html lang="zh-CN">

<head>

    <meta charset="utf-8">
    <title>position</title>
    <style>
        html,
        body {
            height: 100%;
            width: 100%;
            margin: 0 auto;
            padding: 0;
            text-align: center;
        }

        .container {
            position: relative;
            width: 100%;
            height: 100%;
            background: #FFF0F5;
        }

        .header {
            width: 100%;
            height: 100px;
            line-height: 100px;
            position: absolute;
            background-color: #FFDAB9;
        }

        .footer {
            width: 100%;
            height: 100px;
            line-height: 100px;
            position: absolute;
            bottom: 0px;
            background-color: #FFFACD;
        }

        .left {
            top: 100px;
            bottom: 100px;
            background-color: #20B2AA;
            width: 100px;
            position: absolute;
            overflow: auto;
        }

        .middle {
            top: 100px;
            left: 100px;
            bottom: 100px;
            right: 200px;
            background-color: #F0E68C;
            position: absolute;
            overflow: auto;
        }

        .right {
            top: 100px;
            right: 0px;
            background-color: #708090;
            overflow: auto;
            position: absolute;
            bottom: 100px;
            width: 200px;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="header">这是顶部</div>
        <div class="left" id="left_content">
            <script>
                for (var i = 1; i <= 500; i++) {
                    document.getElementById("left_content").innerHTML = document.getElementById("left_content").innerHTML + i.toString() + "<br/>";
                }
            </script>
        </div>
        <div class="middle" id="middle_content">
            <script>
                for (var i = 1; i <= 500; i++) {
                    document.getElementById("middle_content").innerHTML = document.getElementById("middle_content").innerHTML + (i * 10).toString() + "<br/>";
                }
            </script>
        </div>
        <div class="right" id="right_content">
            <script>
                for (var i = 1; i <= 500; i++) {
                    document.getElementById("right_content").innerHTML = document.getElementById("right_content").innerHTML + (i * 100).toString() + "<br/>";
                }
            </script>
        </div>
        <div class="footer">这是底部</div>
    </div>

</body>

</html>