#scrollToTopBtn{display:none;position:fixed;bottom:20px;right:30px;z-index:99;border:none;outline:0;background-color:#007bff;color:#fff;cursor:pointer;padding:15px;border-radius:10px;font-size:18px;transition:background-color .3s,opacity .3s;opacity:.7}#scrollToTopBtn:hover{background-color:#0056b3;opacity:1}