.flexslider{position:relative;height:670px;overflow:hidden;margin-top:90px;}
.slides{position:relative;z-index:1;}
.slides li{height:670px;}
.flex-control-nav{position:absolute;bottom:5%;z-index:2;width:100%;text-align:center;}
.flex-control-nav li{display:inline-block;width:14px;height:13px;background:url('../images/btn2.png') no-repeat;margin:0 5px;}
.flex-control-nav a{display:block;width:13px;height:13px;text-indent:9999px;overflow:hidden;cursor:pointer;margin:0;}
.flex-control-nav .flex-active,.flex-control-nav a:hover{background:url('../images/btn1.png') no-repeat;}