这是通过css3伪类实现的3d按钮，html代码为：
<div id="container_buttons">
<p><a class="a_demo_three">点我！</a></p>
<p><a class="a_demo_three second_button">来嘛，别害怕！</a></p>
<p><a class="a_demo_three third_button">秋叶网络博客（www.mizuiren.com）</a></p>
</div>
css代码为：
#container_buttons{cursor:pointer;}
.a_demo_three {
background-color:#3bb3e0;
font-family: 'Open Sans', sans-serif;
font-size:12px;
text-decoration:none;
color:#fff;
position:relative;
padding:10px 20px;
border-left:solid 1px #2ab7ec;
margin-left:35px;
background-image: linear-gradient(bottom, rgb(44,160,202) 0%, rgb(62,184,229) 100%);
background-image: -o-linear-gradient(bottom, rgb(44,160,202) 0%, rgb(62,184,229) 100%);
background-image: -moz-linear-gradient(bottom, rgb(44,160,202) 0%, rgb(62,184,229) 100%);
background-image: -webkit-linear-gradient(bottom, rgb(44,160,202) 0%, rgb(62,184,229) 100%);
background-image: -ms-linear-gradient(bottom, rgb(44,160,202) 0%, rgb(62,184,229) 100%);
background-image: -webkit-gradient(linear,left bottom,left top,color-stop(0, rgb(44,160,202)),color-stop(1, rgb(62,184,229)));
-webkit-border-top-right-radius: 5px;
-webkit-border-bottom-right-radius: 5px;
-moz-border-radius-topright: 5px;
-moz-border-radius-bottomright: 5px;
border-top-right-radius: 5px;
border-bottom-right-radius: 5px;
-webkit-box-shadow: inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #156785, 0px 10px 5px #999;
-moz-box-shadow: inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #156785, 0px 10px 5px #999;
-o-box-shadow: inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #156785, 0px 10px 5px #999;
box-shadow: inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #156785, 0px 10px 5px #999;
}
.a_demo_three:active {
top:3px;
background-image: linear-gradient(bottom, rgb(62,184,229) 0%, rgb(44,160,202) 100%);
background-image: -o-linear-gradient(bottom, rgb(62,184,229) 0%, rgb(44,160,202) 100%);
background-image: -moz-linear-gradient(bottom, rgb(62,184,229) 0%, rgb(44,160,202) 100%);
background-image: -webkit-linear-gradient(bottom, rgb(62,184,229) 0%, rgb(44,160,202) 100%);
background-image: -ms-linear-gradient(bottom, rgb(62,184,229) 0%, rgb(44,160,202) 100%);
background-image: -webkit-gradient(linear,left bottom,left top,color-stop(0, rgb(62,184,229)),color-stop(1, rgb(44,160,202)));
-webkit-box-shadow: inset 0px 1px 0px #2ab7ec, 0px 2px 0px 0px #156785, 0px 5px 3px #999;
-moz-box-shadow: inset 0px 1px 0px #2ab7ec, 0px 2px 0px 0px #156785, 0px 5px 3px #999;
-o-box-shadow: inset 0px 1px 0px #2ab7ec, 0px 2px 0px 0px #156785, 0px 5px 3px #999;
box-shadow: inset 0px 1px 0px #2ab7ec, 0px 2px 0px 0px #156785, 0px 5px 3px #999;
}
.a_demo_three::before {
text-align: center;
line-height: 20px;
background-color:#2561b4;
content:"1";
35px;
max-height:26px;
height:100%;
position:absolute;
display:block;
padding-top:8px;
top:0px;
left:-36px;
font-size:16px;
font-weight:bold;
color:#8fd1ea;
text-shadow:1px 1px 0px #07526e;
border-right:solid 1px #07526e;
background-image: linear-gradient(bottom, rgb(10,94,125) 0%, rgb(14,139,184) 100%);
background-image: -o-linear-gradient(bottom, rgb(10,94,125) 0%, rgb(14,139,184) 100%);
background-image: -moz-linear-gradient(bottom, rgb(10,94,125) 0%, rgb(14,139,184) 100%);
background-image: -webkit-linear-gradient(bottom, rgb(10,94,125) 0%, rgb(14,139,184) 100%);
background-image: -ms-linear-gradient(bottom, rgb(10,94,125) 0%, rgb(14,139,184) 100%);
background-image: -webkit-gradient(linear,left bottom,left top,color-stop(0, rgb(10,94,125)),color-stop(1, rgb(14,139,184)));
-webkit-border-top-left-radius: 5px;
-webkit-border-bottom-left-radius: 5px;
-moz-border-radius-topleft: 5px;
-moz-border-radius-bottomleft: 5px;
border-top-left-radius: 5px;
border-bottom-left-radius: 5px;
-webkit-box-shadow:inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #032b3a, 0px 10px 5px #999 ;
-moz-box-shadow:inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #032b3a, 0px 10px 5px #999 ;
-o-box-shadow:inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #032b3a, 0px 10px 5px #999 ;
box-shadow:inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #032b3a, 0px 10px 5px #999 ;
}
#container_buttons{height:400px;line-height:50px;}
#container_buttons p{margin:20px 10px;}
.a_demo_three:active::before {
top:-3px;
-webkit-box-shadow:inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #032b3a, 1px 1px 0px 0px #044a64, 2px 2px 0px 0px #044a64, 2px 5px 0px 0px #044a64, 6px 4px 2px #0b698b, 0px 10px 5px #999 ;
-moz-box-shadow:inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #032b3a, 1px 1px 0px 0px #044a64, 2px 2px 0px 0px #044a64, 2px 5px 0px 0px #044a64, 6px 4px 2px #0b698b, 0px 10px 5px #999 ;
-o-box-shadow:inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #032b3a, 1px 1px 0px 0px #044a64, 2px 2px 0px 0px #044a64, 2px 5px 0px 0px #044a64, 6px 4px 2px #0b698b, 0px 10px 5px #999 ;
box-shadow:inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #032b3a, 1px 1px 0px 0px #044a64, 2px 2px 0px 0px #044a64, 2px 5px 0px 0px #044a64, 6px 4px 2px #0b698b, 0px 10px 5px #999 ;
}
.second_button::before {content:"2";}
.third_button::before {content:"3";}