#scrollTopBtn{display:none;position:fixed;bottom:20px;right:30px;z-index:99;border:0;outline:0;background-color:#111827;color:white;cursor:pointer;padding:15px;border-radius:50%;font-size:18px}#scrollTopBtn:hover{background-color:#1f2937}#scrollTopBtn:before{content:'\f077';font:20px FontAwesome;color:#fff}