div绝对居中、宽高自适应、多栏宽度自适应

 1     <style>
 2         body { 
 3             background-color: #e1ddd9; 
 4             font-size: 12px; 
 5             font-family: Verdana, Arial, Helvetica, SunSans-Regular, Sans-Serif; 
 6             color:#564b47; 
 7             padding:0px; 
 8             margin:0px; 
 9         } 
10         #main { 
11             position:absolute; 
12             height:200px; 
13             width:400px; 
14             margin:-100px 0px 0px -200px; 
15             top: 50%; 
16             left: 50%; 
17             text-align: left; 
18             padding: 0px; 
19             background-color: #f5f5f5; 
20             border: 1px dotted #000000; 
21             overflow: auto; 
22         } 
23     </style>