.mod-cart .backtop{position:fixed;right:50px;bottom:100px;cursor:pointer;z-index:9999}.mod-cart .backtop .item{width:69px;height:69px;background-repeat:no-repeat;background-size:100% 100%}.mod-cart .backtop i{position:absolute;width:20px;height:20px;background-color:#ca151d;color:#fff;text-align:center;line-height:20px;border-radius:50%;font-style:normal;right:5px}