*{margin: 0;padding: 0;}
a{color: #FFF;text-decoration: none;font-family: "microsoft yahei";padding: 10px 15px; background: #2c4e2b;border-radius: 15px;display: block; width: 360px;text-align: center;}
a:hover{background: #4b9443;}
body,html{width: 100%;height: 100%;font-size: 50px;background:url(bg.jpg) center no-repeat;background-size:100% 100%;}