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"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>混合布局编程挑战</title><style type="text/css">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</div><div class="main"> <div class="right">rightfffffffffffffffffffffffffffffffffffffffffffffffffffffff<br> fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff<br> fffffffffffffffffffffffffffffffffffffffffffffffffffffff</div> <div class="left">left</div></div><div class="foot">footggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg<br>gggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg</div></body></html>
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