CSS实战：利用CSS相对定位进行多行多列布局
<!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>无标题文档</title>
<style type="text/css">
<!--
body {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 12px;
line-height: 20px;
color: #000000;
}
#head{
margin-right:auto;
margin-left:auto;
width:770px;
height:80px;
background:#A66300;
}
.nav{
clear:both;
margin-right:auto;
margin-left:auto;
width:770px;
height:25px;
line-height:25px;
background:#415800;
}
#main_box{ /*正文区大容器*/
width:770px;
margin-right:auto;
margin-left:auto;
background:#EFEFEF;
}
.row{ /*定义每行*/
width:100%;
clear:both;
}
.left,.right{
float:left;
width:150px;
background:#A6A6A6;
}
.right{
float:right;
}
.left2{ /*用在四列布局上*/
float:left;
width:235px;
background:#333;
color:#FFF;
}
.left3{ /*用在五列布局上*/
border-right:1px solid #FFF;
width:153px;
background:#888;
float:left;
}
.middle{
width:470px;
background:#6699CC;
float:left;
}
#foot{
margin-right:auto;
margin-left:auto;
width:770px;
background:#A66300;
clear:both;
}
-->
</style>
</head>
<body>
<div id="head"></div>
<div class="nav">nav</div>
<!--内容区开始-->
<div id="main_box">
<!--三列左侧-->
<div class="row">
<div class="left">
<p>.left{<br />
float:left;<br />
width:150px;<br />
background:#A6A6A6;<br />
}</p>
</div>
<div class="middle">
<p>.middle{<br />
width:470px;<br />
background:#6699CC;<br />
float:left;<br />
}</p>
</div>
<div class="right">
<p>.right{ <br />
float:right;<br />
width:150px;<br />
background:#999;<br />
} </p>
</div>
</div>
<!--三列结束-->
<div class="nav">nav</div>
<!--四列开始-->
<div class="row">
<div class="left2">
<p>四列的第一列</p>
<p> </p>
&
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