<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.parent{
text-align: center;
height:200px;
padding:0 200px;
overflow: hidden;
}
.middle{
100%;
height:200px;
background: #f60;
float:left;
}
.left{
height:200px;
200px;
background: pink;
float:left;
margin-left:-100%;
position:relative;
left:-200px;
}
.right{
height:200px;
200px;
background: red;
float:left;
margin-left: -200px;
position:relative;
right:-200px;
}
</style>
</head>
<body>
<div class="parent">
<div class="middle">我是main</div>
<div class="left">我是left</div>
<div class="right">我是right</div>
</div>
</body>
</html>