:root{--main-color: rgb(166, 0, 255)}button.scroll-to-top-btn{position:fixed;right:15px;bottom:15px;background-color:var(--main-color);color:#fff;border:none;border-radius:100%;width:40px;height:40px;transition:all 400ms;display:flex;flex-direction:row;justify-content:center;align-items:center;cursor:pointer}button.scroll-to-top-btn:hover{filter:brightness(0.8)}button.scroll-to-top-btn svg{width:28px;height:28px}