.btn-back-to-top{background-color:#0585eb;width:50px;height:50px;padding:0;text-align:center;border-radius:4px;position:fixed;bottom:30px;right:30px;z-index:1000;visibility:hidden;opacity:0}
.btn-back-to-top i{font-size:30px;color:#fff}
.btn-back-to-top.hide{visibility:hidden;opacity:0}
.btn-back-to-top.show{visibility:visible;opacity:1}
@media(max-width:767px){.btn-back-to-top{bottom:10px;right:10px}
}