#button-up{width:60px;height:60px;background:var(--first-color);display:flex;justify-content:center;align-items:center;color:#fff;border-radius:50%;font-size:20px;position:fixed;bottom:50px;right:50px;cursor:pointer;border:4px solid transparent;transition:all .3s ease;transform:scale(0);z-index:999}#button-up:hover{transform:scale(1.1);border-color:#0000001a}