http://blog.csdn.net/21aspnet/archive/2004/11/30/199396.aspx 

     <div>

<button class=btn> 好看的CSDN Button</button><P></p>
<button
class=btn1_mouseout onmouseover="this.className='btn1_mouseover'"
onmouseout="this.className='btn1_mouseout'"
> 好看的Green Button</button>  &nbsp;
<button
class=btn1_mouseout onmouseover="this.className='btn1_mouseover'"
onmouseout="this.className='btn1_mouseout'" DISABLED
> 好看的Green Button</button>
<P>
<button class=btn2> 好看的 e商2003 Button</button>
<P>
<button class=btn3_mouseout onmouseover="this.className='btn3_mouseover'"
onmouseout="this.className='btn3_mouseout'"
onmousedown="this.className='btn3_mousedown'"
  onmouseup="this.className='btn3_mouseup'"
> 好看的QQ Button</button>
<P>
<button class=btn_2k3> 好看的 2k3 Button</button>

        </div>

<style>
.btn {
BORDER-RIGHT: #7b9ebd 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #7b9ebd 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 12px; FILTER: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#ffffff, EndColorStr=#cecfde); BORDER-LEFT: #7b9ebd 1px solid; CURSOR: hand; COLOR: black; PADDING-TOP: 2px; BORDER-BOTTOM: #7b9ebd 1px solid
}
.btn1_mouseout {
BORDER-RIGHT: #7EBF4F 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #7EBF4F 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 12px; FILTER: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#ffffff, EndColorStr=#B3D997); BORDER-LEFT: #7EBF4F 1px solid; CURSOR: hand; COLOR: black; PADDING-TOP: 2px; BORDER-BOTTOM: #7EBF4F 1px solid
}
.btn1_mouseover {
BORDER-RIGHT: #7EBF4F 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #7EBF4F 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 12px; FILTER: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#ffffff, EndColorStr=#CAE4B6); BORDER-LEFT: #7EBF4F 1px solid; CURSOR: hand; COLOR: black; PADDING-TOP: 2px; BORDER-BOTTOM: #7EBF4F 1px solid
}
.btn2 {padding: 2 4 0 4;font-size:12px;height:23;background-color:#ece9d8;border-width:1;}
.btn3_mouseout {
BORDER-RIGHT: #2C59AA 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #2C59AA 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 12px; FILTER: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#ffffff, EndColorStr=#C3DAF5); BORDER-LEFT: #2C59AA 1px solid; CURSOR: hand; COLOR: black; PADDING-TOP: 2px; BORDER-BOTTOM: #2C59AA 1px solid
}
.btn3_mouseover {
BORDER-RIGHT: #2C59AA 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #2C59AA 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 12px; FILTER: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#ffffff, EndColorStr=#D7E7FA); BORDER-LEFT: #2C59AA 1px solid; CURSOR: hand; COLOR: black; PADDING-TOP: 2px; BORDER-BOTTOM: #2C59AA 1px solid
}
.btn3_mousedown
{
BORDER-RIGHT: #FFE400 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #FFE400 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 12px; FILTER: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#ffffff, EndColorStr=#C3DAF5); BORDER-LEFT: #FFE400 1px solid; CURSOR: hand; COLOR: black; PADDING-TOP: 2px; BORDER-BOTTOM: #FFE400 1px solid
}
.btn3_mouseup {
BORDER-RIGHT: #2C59AA 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #2C59AA 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 12px; FILTER: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#ffffff, EndColorStr=#C3DAF5); BORDER-LEFT: #2C59AA 1px solid; CURSOR: hand; COLOR: black; PADDING-TOP: 2px; BORDER-BOTTOM: #2C59AA 1px solid
}
.btn_2k3 {
BORDER-RIGHT: #002D96 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #002D96 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 12px; FILTER: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#FFFFFF, EndColorStr=#9DBCEA); BORDER-LEFT: #002D96 1px solid; CURSOR: hand; COLOR: black; PADDING-TOP: 2px; BORDER-BOTTOM: #002D96 1px solid
}
</style>

转载：.NET2.0 验证控件常用的正则表达式

在线css 精简工具

http://www.cleancss.com/