使用css实现圆角图形绘制

1. <div class="curvedBox">          <span>  
2.         <span class="r1"></span>           <span class="r2"></span>  
3.         <span class="r3"></span>           <span class="r4"></span>  
4.     </span>       <div class="content"> Flex is a cross-platform development framework for creating rich Internet applications (RIAs). Flex enables you to create expressive, high-performance applications that run identically on all major browsers and operating systems.    
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6.         <span class="r4"></span>           <span class="r3"></span>  
7.         <span class="r2"></span>           <span class="r1"></span>  
8.     </span>   </div>    

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