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使用absolute布局

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        *{
            margin:0;
            padding:0;
        }
        .top {
            width: 100%;
            height: 40px;
            background: #000;
            color:#fff;
            position:absolute;
            top:0;
            /*以上设置是重点必须的*/
            text-align:center;
            line-height:40px;
        }
        .bottom{
            width:100%;
            height:40px;
            background:#000;
            color:#fff;
            position:absolute;
            bottom:0;
            /*以上设置是重点必须的*/
            text-align:center;
            line-height:40px;
        }
        .mainBox{
            width:100%;
            position:absolute;
            top:40px;
            bottom:40px;
            /*以上设置是重点必须的*/
        }
        .mainBox .leftBox{
            height:100%;
            width:200px;
            float:left;
            margin-bottom:40px;
            overflow: auto;
            /*以上设置是重点必须的*/
            border:6px solid green;
            -webkit-box-sizing: border-box;
            -moz-box-sizing: border-box;
            box-sizing: border-box;
            text-align:center;
            line-height:40px;
        }
        .mainBox .rightBox{
            height:100%;
            margin-left:220px;
            /*以上设置是重点必须的*/
            border:6px solid crimson;
            -webkit-box-sizing: border-box;
            -moz-box-sizing: border-box;
            box-sizing: border-box;
            overflow: auto;
            text-align:center;
            line-height:40px;
        }
        .left1{
            background-color: #0088cc;
            width: 100%;
            height: 60%;
        }
        .left2{
            background-color: #CCCCCC;
            width: 100%;
            height: 40%;
        }
    </style>
</head>
<body>
<div class="top">顶部,高度40px</div>
<div class="mainBox">
    <div class="leftBox"><!--左盒子,固定宽度200px,高度自适应铺满屏幕剩余高度-->
        <div class="left1"></div>
        <div class="left2"></div>
    </div>
    <div class="rightBox">右盒子,距离左盒子20px,高度自适应宽度自适应铺满屏幕剩余高度</div>
</div>
<div class="bottom">底部,高度40px</div>
</body>
</html>

 

使用absolute布局