#banner{width:620px;height:530px;background:#000;overflow:hidden;position:relative;}#banner_img{display:block;position:relative;}#banner_img li{position:absolute;top:0;left:0;width:620px;height:530px;background-position:center;background-size:cover;display:none;}#banner_img li.item1{background-image:url(../ban/1.jpg);display:block;}#banner_img li.item2{background-image:url(../ban/2.jpg);}#banner_img li.item3{background-image:url(../ban/3.jpg);}#banner_img li.item4{background-image:url(../ban/4.jpg);}#banner_img li.item5{background-image:url(../ban/5.jpg);}#banner_img .ad_txt{position:absolute;top:120px;color:#fff;background:url(../images/ad_txt.png) no-repeat;width:240px;height:240px;}#banner_img .ad_txt h2{font:bold 24px/50px "Microsoft YaHei";width:210px;margin:0 auto;}#banner_img .ad_txt p{font:normal 14px/24px "Microsoft YaHei";width:210px;margin:10% auto 0 auto;height:150px;position:relative;}#banner_img .ad_txt a{background:blue url(../images/ad_txta.png) 50% 50% no-repeat;position:absolute;right:0;bottom:0;border:2px solid #fff;height:15px;width:28px;font:normal 12px/15px "Microsoft YaHei";border-radius:7px;}#banner_ctr{position:absolute;width:620px;height:83px;bottom:0;left:0;z-index:99;}#banner_ctr ul{width:500px;height:83px;position:relative;margin:0 auto;}#banner_ctr li{display:block;width:80px;height:40px;cursor:pointer;background:url(../images/idxta3_span.png);color:#fff;font:normal 12px/40px "Microsoft YaHei";text-align:center;position:absolute;bottom:0;}