#scrollToTopBtn{position:fixed;bottom:40px;right:30px;z-index:100;background-color:#0078ff;color:white;border:none;outline:none;padding:15px;border-radius:50%;box-shadow:0 4px 8px rgba(0,0,0,.3);cursor:pointer;transition:opacity .3s,transform .3s ease-in-out;opacity:0;transform:translateY(20px);}#scrollToTopBtn:hover{background-color:#0078ff;}#scrollToTopBtn.show{opacity:1;transform:translateY(0);}