ul,li {list-style-type:none;}
.first_li {width:200px; border:1px solid #ccc; position:relative;}
.first_li span {cursor:pointer; display:block;text-align:center; line-height:25px; width:100%; height:25px; overflow:hidden;}
.first_li ul li {cursor:pointer;}
.second_ul {width:160px;margin-left:-1px; position:absolute; left:0;bottom:25px; border:1px solid #ccc; background:#fff;}
.second_ul li {display:block; line-height:25px; margin-left:-40px; width:200px;}
.hover {background:#ccc;}