body,html{background:#e9e9e9}.nav{width:100%;z-index:1001;background:#fff}.nav span{display:inline-block;width:33%;text-align:center;line-height:40px;height:40px}.nav .chose{color:#f60}.to_top{background:#fff;border:1px solid #dfdfdf;position:fixed;bottom:20px;right:20px;border-radius:50%;width:40px;height:40px;line-height:40px;text-align:center;z-index:11}.to_top .iconfont{font-size:20px;color:#999}.weui-loadmore__tips{color:#999}.clr{clear:both}