margin:0padding:0的意思是 边距为0，无缝
里面的长宽和内容自己修改。<!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/htmlcharset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
*{
margin:0
padding:0
}
.d1 {
margin: auto
height: 200px
width: 504px
}
.d2 {
margin: auto
height: 200px
width: 504px
}
.d3 {
margin: auto
height: 200px
width: 504px
}
.d1-1 {
height: 100px
width: 504px
float: left
background-color: #000
}
.d1-2 {
height: 100px
width: 252px
float: left
background-color: #030
}
.d1-3 {
height: 100px
width: 252px
float: left
background-color: #CF0
}
.d2-1 {
height: 200px
width: 252px
float: left
background-color: #03F
}
.d2-2 {
height: 200px
width: 252px
float: left
background-color: #F00
}
.d3-1 {
height: 200px
width: 168px
float: left
background-color: #900
}
.d3-2 {
height: 200px
width: 168px
float: left
background-color: #FFC
}
.d3-3 {
height: 200px
width: 168px
float: left
background-color: #36C
}
</style>
</head>
<body>
<div class="d1">
<div class="d1-1"></div>
<div class="d1-2"></div>
<div class="d1-3"></div>
</div>
<div class="d2">
<div class="d2-1"></div>
<div class="d2-2"></div>
</div>
<div class="d3">
<div class="d3-1"></div>
<div class="d3-2"></div>
<div class="d3-3"></div>
</div>
</body>
</html>
