/*全页字体设置*/
body {font-family:Arial, Helvetica, sans-serif;font-size:16px;color:#fff;}
/*主体设置*/
#main {margin:80px auto 50px auto;}
/*使用rgba实现父层透明，子层不透明效果*/
#container {margin:0 auto;padding:10px;width:50%;height:300px;background:rgba(100,100,100,0.6);border-radius:15px;text-align:center;}
#nav {margin:30px auto;opacity:1}
ul {padding:0;list-style-type:none;}
li {margin:10px 0;}
.contact {margin:30px auto;float:right;}
.contact p {width:50px;height:50px;}
a:link {text-decoration:none;color:#fff}
a:visited {color:#fff;} 
a:hover {text-decoration:underline;}
a:active {color:#6ff;}