1.select去掉默认样式
background: transparent;
-webkit-appearance: none;

2.css实现按钮
background: -webkit-gradient(linear, 0 0, 0 100%, from(#40BF49), to(#0D9D22));
color: #fff;
border-color: #008F01;
width: 298px;
height: 41px;
line-height: 41px;
border: 1px solid #B3B3B3;
border-radius: 3px;
text-decoration: none;
text-align: center;