*{margin:0;padding:0}
ul,li{list-style:none}
li{float:left;text-align:center;margin:5px}
li a{color:#999;text-decoration: inherit;display:block;border:1px solid #ccc;width:30px;height:30px;line-height:30px;}

li a.on{background:#3DC95E;border-color:#3DC95E;color:#fff}