CSS 左边div固定，右边div自适应

　　有时候我们会有这样的需求，如图，aside是导航或者某些链接，右边的main是显示重要的内容，左边需要定宽，右边的main能够自适应剩余的宽度：

　

<!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>
    <title>test</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta http-equiv="Content-Language" content="zh-CN" />
    <meta name="Keywords" content="" />
    <meta name="Description" content="" />
    <!-- <link rel="stylesheet" href="style/.css" type="text/css" /> -->
    <style type="text/css">
        *{margin:0; padding:0;}
        /* div{border:1px solid #CCC;} */
        .home{width:70%; min-width:270px;margin:0 auto;}
        .header{height:80px; width:100%; background:#CCC}
        .nav{height:50px; width:100%; background:#bbb}
        .content{}
        .content .aside{width:260px; height:400px; float:left; background:#999}
        .content .main{height:400px; margin-left:260px; overflow:hidden;zoom:1; background:#eee}
        .footer{height:80px; background:#888;}
    </style>
</head>
<body>
    <div class="home">
        <div class="header">
            header
        </div>
        <div class="nav">
            nav
        </div>
        <div class="content">
            <div class="aside">aside</div>
            <div class="main">main</div>
        </div>
        <div class="footer">
            footer
        </div>
    </div>
</body>
</html>