.back-to-top-btn{position:fixed;right:30px;bottom:30px;z-index:999;width:44px;height:44px;border-radius:50%;border:none;background:#195394;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 12px #19539466;transition:all .3s ease;animation:back-to-top-fade-in .3s ease}.back-to-top-btn:hover{background:#14467e;transform:translateY(-3px);box-shadow:0 4px 16px #19539480}.back-to-top-btn:active{transform:translateY(0)}@keyframes back-to-top-fade-in{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media(max-width:768px){.back-to-top-btn{right:16px;bottom:16px;width:40px;height:40px}}