简洁型css圆角：

3D圆角矩形:

<style type="text/css">

.raised{background:transparent;width:40%;}

.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; background:#999;}

.raised .boxcontent{display:block;background:#ccc;border-left:1px solid #fff
;border-right:1px solid #999;}

</style>

<div class="raised">

<b class="b1"></b><b class="b2"></b><b class="b3"></b><b class="b4"></b>

<div class="boxcontent">

<h1>3D圆角矩形</h1>

</div>

<b class="b4b"></b><b class="b3b"></b><b class="b2b"></b><b class="b1b"></b>

</div>

<style type="text/css">

.serif {

  background: transparent; width:40%;

  }

.serif h1, .serif p {margin:0 ;}

.serif h1 {font-size:2em; color:#fff;}

.serif p {padding-bottom:0.5em;}

.serif .b1, .serif .b2, .serif .b3, .serif .b4 {display:block; overflow:hidden;font-size:1px; }

.serif .b1, .serif .b2, .serif .b3 {height:1px;}

.serif .b2, .serif .b3 {

  background:#fc0; 

  border-left:1px solid #fff; 

  border-right:1px solid #fff;

  }

.serif .b4 {

  background:#fc0; 

  border-left:1px solid #fff; 

  border-right:1px solid #fff;

  }

.serif .b1 {margin:0; background:#fff;}

.serif .b2 {margin:0 1px; border-width:0 2px;}

.serif .b3 {margin:0 3px;}

.serif .b4 {height:2px; margin:0 4px;}

.serif .boxcontent {

  display:block;  

  background:#fc0; 

  border-left:1px solid #fff; 

  border-right:1px solid #fff; 

  margin:0 5px;

  }

</style>

<div class="serif">

<b class="b1"></b><b class="b2"></b><b class="b3"></b><b class="b4"></b>

<div class="boxcontent">

<h1>反向css圆角矩形</h1>

</div>

<b class="b4"></b><b class="b3"></b><b class="b2"></b><b class="b1"></b>

</div>

<style type="text/css">

.curved {

  background:transparent;

  width:40%;

  }

.curved h1, .curved p {margin:0 10px;}

.curved h1 {font-size:2em;color:#fff;}

.curved p {}{padding-bottom:0.5em;}

.curved .b1, .curved .b2, .curved .b3, .curved .b4 {display:block;overflow:hidden;height:1px;
font-size:1px;}

.curved .b2, .curved .b3, .curved .b4 {

  background:#e0cea3;

  border-left:1px solid #fff;

  border-right:1px solid #fff;

  }

.curved .b1 {margin:0 4px;background:#fff;}

.curved .b2 {margin:0 4px;height:2px;}

.curved .b3 {margin:0 3px;}

.curved .b4 {margin:0;height:1px;border-width:0 3px 0 3px;}

.curved .boxcontent {

  display:block;

  background:#e0cea3;

  border:0 solid #fff;

  border-width:0 1px;

  }

</style>

<div class="curved">

<b class="b1"></b><b class="b2"></b><b class="b3"></b><b class="b4"></b>

<div class="boxcontent">

<h1>略带菱形的css圆角矩形</h1>

</div>

<b class="b4"></b><b class="b3"></b><b class="b2"></b><b class="b1"></b>

</div>

<style type="text/css">

.pillar {

  background:transparent;

  width:40%;

  }

.pillar h1, .pillar p {margin:0 ;}

.pillar h1 {font-size:2em;color:#fff;}

.pillar p {padding-bottom:0.5em;}

.pillar .b1, .pillar .b2, .pillar .b3, .pillar .b4 {

  display:block;

  overflow:hidden;

  font-size:1px;

  }

.pillar .b1, .pillar .b2, .pillar .b4 {}{height:1px;}

.pillar .b2, .pillar .b3 {

  background:#d66;

  border-left:1px solid #fff;

  border-right:1px solid #fff;

  }

.pillar .b4 {background:#d66;border-left:4px solid #fff;border-right:4px solid #fff;}

.pillar .b1 {margin:0 2px;background:#fff;}

.pillar .b2 {margin:0 1px;border-width:0 1px;}

.pillar .b3 {height:2px;margin:0; }

.pillar .b4 { margin:0 2px; }

.pillar .boxcontent {

  display:block;

  background:#d66;

  border-left:1px solid #fff;

  border-right:1px solid #fff;

  margin:0 5px;

  }

</style>

<div class="pillar">

<b class="b1"></b><b class="b2"></b><b class="b3"></b><b class="b2"></b><b class="b4"></b>

<div class="boxcontent">

<h1>特殊css圆角矩形</h1>

</div>

<b class="b4"></b><b class="b2"></b><b class="b3"></b><b class="b2"></b><b class="b1"></b>

</div>