纯CSS无图打造圆角Table

CSS代码:

<style type="text/css"> 
div.RoundedCorner...{background: #9BD1FA} 
b.rtop, b.rbottom...{display:block;background: #FFF} 
b.rtop b, b.rbottom b...{display:block;height: 1px;overflow:  
hidden; background: #9BD1FA} 
b.r1...{margin: 0 5px} 
b.r2...{margin: 0 3px} 
b.r3...{margin: 0 2px} 
b.rtop b.r4, b.rbottom b.r4...{margin: 0 1px;height: 2px} 
</style> 

 
HTML代码:

<div class="RoundedCorner"> 
<b class="rtop"><b class="r1"></b><b class="r2"></b> 
<b class="r3"></b><b class="r4"></b></b> 
    <table style="width:500px;height:100px;"> 
        <tr> 
               <td>单元格1</td> 
           <td>单元格2</td> 
        </tr> 
    <tr> 
               <td>单元格3</td> 
           <td>单元格4</td> 
        </tr> 
    </table> 
<b class="rbottom"><b class="r4"></b><b class="r3"></b> 
<b class="r2"></b><b class="r1"></b></b> 
</div>