第一种平面
<style type="text/css">
div.RoundedCorner{background: #9BD1FA;width:66%;}
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>
<div class="RoundedCorner">
<b class="rtop"><b class="r1"></b><b class="r2"></b><b class="r3"></b><b class="r4"></b></b>
<br>
div+CSS能实现圆边圆角效果,但是特复杂，不推荐使用.
div border属性
<br><br>
<b class="rbottom"><b class="r4"></b><b class="r3"></b><b class="r2"></b><b class="r1"></b></b>
</div>
3D版
<html>
<head>
<title>3D圆角</title>
<style type=text/css>
.raised{background:transparent;width:100%;}
.raised h1,.raised p{margin:0 10px;}
.raised h1{font-size:2em;color:#fff;}
.raised p{padding-bottom:0.5em;}
.raised .b1,.raised .b2,.raised .b3,
.raised .b4,.raised .b1b,.raised .b2b,
.raised .b3b,.raised
.b4b{display:block;overflow:hidden;font-size:1px;}
.raised .b1,.raised .b2,.raised .b3,.raised .b1b,
.raised .b2b,.raised .b3b{height:1px;}
.raised .b2{background:#ccc;border-left:1px solid #fff;border-right:1px solid #eee;}
.raised .b3{background:#ccc;border-left:1px solid #fff;border-right:1px solid #ddd;}
.raised .b4{background:#ccc;border-left:1px solid #fff;border-right:1px solid #aaa;}
.raised .b4b{background:#ccc;border-left:1px solid #eee;border-right:1px solid #999;}
.raised .b3b{background:#ccc;border-left:1px solid #ddd;border-right:1px solid #999;}
.raised .b2b{background:#ccc;border-left:1px solid #aaa;border-right:1px solid #999;}
.raised .b1{margin:0 5px;background:#fff;}
.raised .b2, .raised .b2b{margin:0 3px;border-width:0 2px;} .raised .b3, .raised .b3b{margin:0 2px;}
.raised .b4, .raised .b4b{height:2px; margin:0 1px;} .raised .b1b{margin:0 5px; backgroun
d:#999;}
.raised .boxcontent{display:block;background:#ccc;border-left:1px solid #fff;border-right:1px solid #999;}
</style>
</head>
<body>
<div class="raised">
  <b class="b1"></b><b class="b2"></b><b class="b3"></b><b class="b4"></b>
  <div class="boxcontent">
    <h1>3D圆角</h1>
  </div>
<b class="b4b"></b><b class="b3b"></b><b class="b2b"></b><b class="b1b"></b>
</div>
</body>
</html>

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