.out {width:100%;position: relative;}
.out .banner_list{overflow:hidden;width:100%;height:500px;}
.out li,.out .img li{width:100%;list-style:none;height:500px;}
.out .img li a{display:block;width:auto;height:500px;}
.out .img li {position: absolute;left:0;top:0;display: none;}
.out .num {position: absolute;bottom: 15px;left: 0;text-align:center;width: 100%;display:none;}
.out .num li {font-family: "宋体";font-size:12px;width:116px;height: 20px;line-height:20px;background-color:rgba(255,255,255,0.7);color: #333;text-align:center;display: inline-block;margin:0 10px;cursor: pointer;}
.out .num li.active {color: #fff;background-color:rgba(0,0,0,0.7);}
.out .btn {position:absolute;top: 50%;margin-top:-50px;width: 50px;height: 100px;line-height:100px;background:rgba(0, 0, 0, 0.3);font-size:40px;color: #fff;text-align:center;display: none;}
.out .btn:hover{background:rgba(0, 0, 0, 0.7);}
.out .left {left: 20px;}
.out .right {right: 20px;}
.out:hover .btn {display: block;cursor: pointer;}