<body>
<div class="box">
<div class="left"></div>
<div class="center"></div>
<div class="right"></div>
</div>
</div>
</body>
</html>
<style>
.box {
position: relative;
}
.left,
.right {
position: absolute;
width: 200px;
height: 200px;
top: 0;
}
.left {
left: 0;
background: red;
}
.right {
right: 0;
background: blue;
}
.center {
margin: 0 200px;
background: yellow;
height: 400px;
}
</style>
