.scrollToTopButton{position:fixed;bottom:20px;right:20px;z-index:999;width:40px;height:40px;border-radius:50%;background-color:#555;color:#fff;border:none;outline:none;cursor:pointer;opacity:.8;transition:opacity .3s;display:flex;justify-content:center;align-items:center}.scrollToTopButton:hover{opacity:1}.scrollToTopIcon{font-size:20px}