.back-to-top{position:fixed;right:20px;bottom:20px;padding:10px;z-index:10;border-radius:0;background-color:rgba(0,161,237,.75);-webkit-transition:0.3s;transform:rotate(45deg);transition:0.3s}.back-to-top:hover{background-color:rgba(0,43,127,.75)}.back-to-top .icon{display:block;color:#fff;width:20px;height:20px;transform:rotate(-45deg)}.js .back-to-top{// if JS is enabled,hide back to top visibility:hidden;opacity:0}.js .back-to-top--is-visible{// show button visibility:visible;opacity:1}@media (max-width:450px){.back-to-top{position:fixed;right:15px;bottom:15px;padding:8px}.back-to-top .icon{width:15px;height:15px}}