css无图片实现圆角框

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<!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/html; charset=gb2312" />
<title>无标题文档</title>
<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>
</head>

<body>
<div class="RoundedCorner">
<b class="rtop">

 

<b class="r1"> </b>

<b class="r2"> </b>

<b class="r3"> </b>

<b class="r4"> </b>

 

 </b>
<br>无图片实现圆角框 <br> <br>
<br>无图片实现圆角框 <br> <br>
<br>无图片实现圆角框 <br> <br>
<br>无图片实现圆角框 <br> <br>

<br>无图片实现圆角框 <br> <br>
<br>无图片实现圆角框 <br> <br>
<br>无图片实现圆角框 <br> <br>
<br>无图片实现圆角框 <br> <br>


<b class="rbottom">

 

<b class="r4"> </b>

<b class="r3"> </b>

<b class="r2"> </b>

<b class="r1"> </b>

 

</b>
</div>
</body>
</html>