.banner{border:0px solid #f9f9f9; width:1024px;height:250px; overflow:hidden; position:relative;}
.banner .img{ width:8144px; position:absolute; left:0px; top:0;}
.banner .img li{ float:left;}

.banner .num{ position:absolute; width:100%; bottom:10px; left:0; text-align:center; font-size:0px;}
.banner .num li{ width:10px;height:10px; background:#888; border-radius:50%; display:inline-block; margin:0 3px; cursor:pointer;}
.banner .num li.on{ background:#F60;}

.banner .btn{ width:30px; height:50px; background:rgba(0,0,0,0.5); position:absolute; top:50%; margin-top:-25px; cursor:pointer; text-align:center; line-height:50px; color:#fff; font-size:40px; font-family:"宋体"; display:none;}
.banner:hover .btn{ display:block;}

.banner .btn_l{ left:0;}
.banner .btn_r{ right:0;}