如何使用绝对值来对元素进行定位

<html>
<head>
<style type="text/css">
div.container
{
width:100%;
margin:0px;
border:1px solid gray;
line-height:150%;
}
div.header,div.footer
{
padding:0.5em;
color:white;
background-color:gray;
clear:left;
}
h1.header
{
padding:0;
margin:0;
}
div.left
{
float:left;
width:160px;
margin:0;
padding:1em;
}
div.content
{
margin-left:190px;
border-left:1px solid gray;
padding:1em;
}
</style>
</head>
<body>

<div class="header"><h1 class="header">W3School.com.cn</h1></div>

<div class="left"><p>"Never increase, beyond what is necessary, the number of entities required to explain anything." William of Ockham (1285-1349)</p></div>

<div class="content">
<h2>Free Web Building Tutorials</h2>
<p>At W3School.com.cn you will find all the Web-building tutorials you need,
from basic HTML and XHTML to advanced XML, XSL, Multimedia and WAP.</p>
<p>W3School.com.cn - The Largest Web Developers Site On The Net!</p></div>

</body>
</html>

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