button应该是UI库中最常用到的一种。我个人对google+的那种简单的button风格比较喜欢，因为那样在不同的浏览器下视觉差异不是很大。不过现在自己确实已经没有心思去琢磨怎么去弥补ie的不足，所以下面的东西就不要拿ie打开了。
还是贴出代码吧
<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
.mt{margin-top: 20px;}
.button{
display: inline-block;
*display: inline;
zoom: 1;
padding: 6px 20px;
margin: 0;
cursor: pointer;
border: 1px solid #bbb;
overflow: visible;
font: bold 13px arial, helvetica, sans-serif;
text-decoration: none;
white-space: nowrap;
color: #555;
background-color: #ddd;
background-image: linear-gradient(top, rgba(255,255,255,1),
rgba(255,255,255,0));
-webkit-transition: background-color .2s ease-out;
-moz-transition: background-color .2s ease-out;
background-clip: padding-box; /* Fix bleeding */
border-radius: 3px;
box-shadow: 0 1px 0 rgba(0, 0, 0, .3),
0 2px 2px -1px rgba(0, 0, 0, .5),
0 1px 0 rgba(255, 255, 255, .3) inset;
text-shadow: 0 1px 0 rgba(255,255,255, .9);
}
.button:hover{
background-color: #eee;
color: #333;
}
.button:active{
background: #e9e9e9;
position: relative;
top: 1px;
text-shadow: none;
box-shadow: 0 1px 1px rgba(0, 0, 0, .3) inset;
}
.button.small{
padding: 4px 12px;
}
/* Larger buttons styles */
.button.large{
padding: 12px 30px;
text-transform: uppercase;
}
.button.large:active{
top: 2px;
}
.button.green,.button.red,.button.blue{
color: #FFF;
text-shadow: 0 1px 0 rgba(0,0,0,.5);
background-image: -webkit-linear-gradient(top, rgba(255,255,255,.3), rgba(255,255,255,0));
background-image: -moz-linear-gradient(top, rgba(255,255,255,.3), rgba(255,255,255,0));
background-image: -o-linear-gradient(top, rgba(255,255,255,.3), rgba(255,255,255,0));
background-image: -ms-linear-gradient(top, rgba(255,255,255,.3), rgba(255,255,255,0));
background-image: linear-gradient(top, rgba(255,255,255,.3), rgba(255,255,255,0));
}
/*********green button***********/
.button.green{
background-color: #57a957;
border-color: #57a957;
}
.button.green:hover{
background-color: #62c462;
}
.button.green:active{
background: #57a957;
}
/************red button***********/
.button.red{
background-color: #c43c35;
border-color: #c43c35;
}
.button.red:hover{
background-color: #ee5f5b;
}
.button.red:active{
background: #c43c35;
}
/*************blue button***************/
.button.blue{
background-color: #269CE9;
border-color: #269CE9;
}
.button.blue:hover{
background-color: #70B9E8;
}
.button.blue:active{
background: #269CE9;
}
/*******disabled button*********/
.button[disabled], .button[disabled]:hover, .button[disabled]:active{
border-color: #eaeaea;
background: #fafafa;
cursor: default;
position: static;
color: #999;
/* Usually, !important should be avoided but here it's really needed :) */
box-shadow: none !important;
text-shadow: none !important;
}
.green[disabled], .green[disabled]:hover, .green[disabled]:active{
border-color: #57A957;
background: #57A957;
color: #D2FFD2;
}
.red[disabled], .red[disabled]:hover, .red[disabled]:active{
border-color: #C43C35;
background: #C43C35;
color: #FFD3D3;
}
.blue[disabled], .blue[disabled]:hover, .blue[disabled]:active{
border-color: #269CE9;
background: #269CE9;
color: #93D5FF;
}
/*********group button**********/
.button-group,.button-group li{
display: inline-block;
*display: inline;
zoom: 1;
}
.button-group{
font-size: 0; /* Inline block elements gap - fix */
margin: 0;
padding: 0;
background:#f1f1f1;
border-bottom: 1px solid rgba(0, 0, 0, .07);
padding: 7px;
border-radius: 7px;
}
.button-group li{
margin-right: -1px; /* Overlap each right button border */
}
.button-group .button{
font-size: 13px; /* Set the font size, different from inherited 0 */
border-radius: 0;
}
.button-group .button:active{
box-shadow: 0 0 1px rgba(0, 0, 0, .2) inset,
5px 0 5px -3px rgba(0, 0, 0, .2) inset,
-5px 0 5px -3px rgba(0, 0, 0, .2) inset;
}
.button-group li:first-child .button{
border-radius: 3px 0 0 3px;
}
.button-group li:first-child .button:active{
box-shadow: 0 0 1px rgba(0, 0, 0, .2) inset,
-5px 0 5px -3px rgba(0, 0, 0, .2) inset;
}
.button-group li:last-child .button{
border-radius: 0 3px 3px 0;
}
.button-group li:last-child .button:active{
box-shadow: 0 0 1px rgba(0, 0, 0, .2) inset,
5px 0 5px -3px rgba(0, 0, 0, .2) inset;
}
</style>
</head>
<body>
<button class="small button">Button</button>
<button class="button">Button</button>
<button class="large button">Button</button>
<div class="mt">
<button class="button">Button</button>
<button class="button green">Button</button>
<button class="button red">Button</button>
<button class="button blue">Button</button>
</div>
<div class="mt">
<button class="button" disabled="disabled">Button</button>
<button class="button green" disabled="disabled">Button</button>
<button class="button red" disabled="disabled">Button</button>
<button class="button blue" disabled="disabled">Button</button>
</div>
<div class="mt">
<ul class="button-group">
<li><button class="button">Button1</button></li>
<li><button class="button">Button2</button></li>
<li><button class="button">Button3</button></li>
<li><button class="button">Button4</button></li>
</ul>
</div>
<div class="mt">
<ul class="button-group">
<li><button class="button">Button1</button></li>
<li><button class="button green">Button2</button></li>
<li><button class="button red">Button3</button></li>
<li><button class="button blue">Button4</button></li>
</ul>
</div>
</body>
</html>