.fl{float:left;}
.fr{float:right;}
.clear{clear:both;}
.clearfix:after,.clearfix:before{display:table;content:'';}
.clearfix:before{clear:both;}
.goBackTop1{width:40px;line-height:40px;cursor:pointer;text-align:center;color:#fff;font-size:20px;position:fixed;right:5px;bottom:90px;z-index:90;opacity:.9;visibility:hidden;}
.goBackTop1 span:first-child{position:relative;display:block;text-align:center;width:40px;height:40px;margin-bottom:8px;border-radius:2px;background:url(/static/images/ico_cate.png) 0 0 no-repeat;background-size:18px 15px;background-position:50% 50%;background-color:#57a7f6;}
.goBackTop1 span:last-child{position:relative;background:url(https://st.douding.cn/images_cn/iphone/miniDocin/top.png) 0 0 no-repeat;background-size:18px 15px;background-position:50% 50%;display:block;height:40px;text-align:center;background-color:#454545;border-radius:2px;}
.header_nav_list{height:0;}