DIV布局问题
我算得你的这个总宽508像素，
<style type="text/css">
*{
margin:0;
padding:0;
}
#box{
width:508px;
margin:0 auto;
}
#box .part1{
height:45px;
}
#box .part1 .no1{
float: left;
width:40%;
height:45px;
margin-right:100px;
background-color:blue;
}
#box .part1 .no2{
float: left;
width:40%;
height:45px;
background-color:blue;
}
#box .part2{
margin-top:20px;
height:45px;
margin-bottom: 20px;
}
#box .part2 .no1{
float: left;
width:40%;
height:45px;
margin-right:100px;
background-color:blue;
}
#box .part2 .no2{
float: left;
width:40%;
height:45px;
background-color:blue;
}
#box .part3{
clear:both;
height:52px;
background-color:blue;
}
</style>
<body>
<div id="box">
<div class="part1">
<div class="no1"></div>
<div class="no2"></div>
</div>
<div class="part2">
<div class="no1"></div>
<div class="no2"></div>
</div>
<div class="part3"></div>
</div>
</body>
</html>
