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如何实现自适应宽度

我是新手，想请教一下大神们，如何修改以下代码，才能是top、foot、right实现宽度自适应？

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>混合布局编程挑战</title>

body{ margin:0; padding:0; font-size:30px; color:#green}

.top{width:100%;height:100px;background:#CCC;}

.main{height:600px;background:red;position:relative;}

.left{height:600px;width:200px;background:blue;}

.right{height:600px;background:#9fc;position:absolute;right:0;top:0;bottom:0;left:210px;}

.foot{width:100%;height:100px;background:#f93;}

</style>

</head>

<body>

<div class="top">top

<br>

</div>

<div class="right">rightfffffffffffffffffffffffffffffffffffffffffffffffffffffff<br>

fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff<br>

fffffffffffffffffffffffffffffffffffffffffffffffffffffff</div>

</div>

<div class="foot">footggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg<br>

gggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg</div>

</body>

</html>

Lukkk

2016-09-25

源自：如何用CSS进行网页布局

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stone310
2016-11-14

宽改成百分比

body{ margin:0; padding:0; font-size:30px; color:#green}
.top{width:100%;height:100px;background:#CCC;}
.main{height:600px;background:red;position:relative;width:100%;}
.left{height:600px;width:40%;background:blue;position: absolute;left:0;}
.right{height:600px;background:#9fc;position:absolute;right:0;width:40%;word-break: break-all;}
.foot{width:100%;height:100px;background:#f93;word-break: break-all;}