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：

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>testtitle>
    <meta http-equiv="Content-Type" content="text/html; " />
    <meta http-equiv="Content-Language" content="zh-CN" />
    <meta name="Keywords" content="" />
    <meta name="Description" content="" />
    
    <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">asidediv>
            <div class="main">maindiv>
        div>
        <div class="footer">
            footer
        div>
    div>
body>
html>