<!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>