效果图
源码（中间部分为自适应）：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style>
header{
width: 100%;
height: 80px;
background-color: #f0ad4e;
}
.main{
width: 100%;
height: 800px;
overflow: hidden;
}
.main-left,.main-right{
float: left;
width: 50%;
height: 800px;
}
.main-left{
background-color: #31b0d5;
border: 100px;
}
.main-right{
background-color: #5cb85c;
}
footer{
width: 100%;
height: 80px;
background-color: #337ab7;
}
</style>
</head>
<body>
<header></header>
<div class="main">
<div class="main-left"></div>
<div class="main-right"></div>
</div>
<footer></footer>
</body>
</html>
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