.back-to-top-btn{position:fixed;bottom:2rem;right:2rem;z-index:1000;background-color:#fff;color:#000;border:none;width:40px;height:40px;border-radius:50%;box-shadow:0 0 24px 0 hsla(0,0%,58%,.526);cursor:pointer;font-size:1.25rem;transition:background-color .3s ease;display:flex;align-items:center;justify-content:center}.back-to-top-btn:hover{background-color:#f0f0f0}