body,div,ul,li{margin:0;padding:0;}
img{border:0;}

.banner{margin:0px auto 0;width:530px;overflow:hidden;padding-bottom: 10px}
.large_box{margin-bottom:10px;width:530px;height:500px;overflow:hidden;}
.large_box img{display:block; height: 500px}
.small_box{width:530px;height:138px;overflow:hidden;margin-top: 26px;}
.small_list{position:relative;float:left;width:867px;height:138px;overflow:hidden;}
.small_list ul{height:138px;overflow:hidden;}
.small_list ul li{position:relative;float:left;margin-right:11px;width:206px;height: 138px}
.small_list ul li img{display:block;width: 100%;height: 100%}
.small_list ul li .bun_bg{display:none;position:absolute;top:0;left:0;width:206px;height:138px;background:#000;filter:alpha(opacity=60);-moz-opacity:0.6;-khtml-opacity:0.6;opacity:0.6;}
.small_list ul li.on .bun_bg{display:block;}
.btn{display:block;width:61px;height:138px;background-color:#000;background-repeat:no-repeat;background-position:center center;cursor:pointer;}
.left_btn{float:left;margin-right:10px;background-image:url(20170710left_btn.png);}
.right_btn{float:right;background-image:url(20170710right_btn.png);}