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首先来看看效果图：
要实现以上的圆角按钮的效果，HTML 代码如下，就这么简单：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Futurico UI - CSS3 Buttons Tutorial</title>
<style type="text/css">/* preview page style */
body{background:url(img/bg.jpg) center no-repeat;width:1000px;margin:0 auto;}
#css{width:500px;margin:0 auto;}
#css{width:550px;padding-top:15px;}
a.button{margin-left:69px;}
a.big{margin-left:10px;margin-bottom:30px;}
hr{border-color:#666;margin-top:50px;}
/* CSS 处理圆角 ，使得按钮圆润 */
.button {
display: inline-block;
position: relative;
margin: 10px;
padding: 0 20px;
text-align: center;
text-decoration: none;
text-shadow: 1px 1px 1px rgba(255,255,255,.22);
font: bold 12px/25px Arial, sans-serif;
-webkit-border-radius: 30px;
-moz-border-radius: 30px;
border-radius: 30px;
-webkit-box-shadow: 1px 1px 1px rgba(0,0,0,.29), inset 1px 1px 1px rgba(255,255,255,.44);
-moz-box-shadow: 1px 1px 1px rgba(0,0,0,.29), inset 1px 1px 1px rgba(255,255,255,.44);
box-shadow: 1px 1px 1px rgba(0,0,0,.29), inset 1px 1px 1px rgba(255,255,255,.44);
-webkit-transition: all 0.15s ease;
-moz-transition: all 0.15s ease;
-o-transition: all 0.15s ease;
-ms-transition: all 0.15s ease;
transition: all 0.15s ease;
}
/*处理下当鼠标移到按钮上方时显示不同的效果*/
.button:hover {
-webkit-box-shadow: 1px 1px 1px rgba(0,0,0,.29), inset 0px 0px 2px rgba(0,0,0, .5);
-moz-box-shadow: 1px 1px 1px rgba(0,0,0,.29), inset 0px 0px 2px rgba(0,0,0, .5);
box-shadow: 1px 1px 1px rgba(0,0,0,.29), inset 0px 0px 2px rgba(0,0,0, .5);
}
.button:active {
-webkit-box-shadow: inset 0px 0px 3px rgba(0,0,0, .8);
-moz-box-shadow: inset 0px 0px 3px rgba(0,0,0, .8);
box-shadow: inset 0px 0px 3px rgba(0,0,0, .8);
}
/*为了让按钮更大一点，我们增加了个 big 样式 Big Button Style */
.big {
padding: 0 40px;
padding-top: 10px;
height: 45px;
text-transform: uppercase;
font: bold 20px/22px Arial, sans-serif;
}
.big span {
display: block;
text-transform: none;
font: italic normal 12px/18px Georgia, sans-serif;
text-shadow: 1px 1px 1px rgba(255,255,255, .12);
}
/*为这三个按钮分别 实现 立体效果 Green Color */
.green {
color: #3e5706;
background: #a5cd4e; /* Old browsers */
background: -moz-linear-gradient(top, #a5cd4e 0%, #6b8f1a 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#a5cd4e), color-stop(100%,#6b8f1a)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #a5cd4e 0%,#6b8f1a 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #a5cd4e 0%,#6b8f1a 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #a5cd4e 0%,#6b8f1a 100%); /* IE10+ */
background: linear-gradient(top, #a5cd4e 0%,#6b8f1a 100%); /* W3C */
}
/* Blue Color */
.blue {
color: #19667d;
background: #70c9e3; /* Old browsers */
background: -moz-linear-gradient(top, #70c9e3 0%, #39a0be 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#70c9e3), color-stop(100%,#39a0be)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #70c9e3 0%,#39a0be 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #70c9e3 0%,#39a0be 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #70c9e3 0%,#39a0be 100%); /* IE10+ */
background: linear-gradient(top, #70c9e3 0%,#39a0be 100%); /* W3C */
}
/* Gray Color */
.gray {
color: #515151;
background: #d3d3d3; /* Old browsers */
background: -moz-linear-gradient(top, #d3d3d3 0%, #8a8a8a 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#d3d3d3), color-stop(100%,#8a8a8a)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #d3d3d3 0%,#8a8a8a 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #d3d3d3 0%,#8a8a8a 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #d3d3d3 0%,#8a8a8a 100%); /* IE10+ */
background: linear-gradient(top, #d3d3d3 0%,#8a8a8a 100%); /* W3C */
}
</style>
<meta name="robots" content="noindex,follow" />
</head>
<body>
<div id="css">
<a href="#" class="button big green">sign in <span>One minute</span></a>
<a href="#" class="button big blue">sign in <span>One minute</span></a>
<a href="#" class="button big gray">sign in <span>One minute</span></a>
<br>
<a href="#" class="button green">button</a>
<a href="#" class="button blue">button</a>
<a href="#" class="button gray">button</a>
</div>
</body>
</html>
如果把样式全部提取出来，是不是精简的很......完美的CSS3按钮解决方案。