.arrow-up{position:fixed;bottom:30px;right:30px;width:4rem;height:4rem;background-color:var(--primary-color-button-123d4d);color:#fff;border:none;border-radius:50%;cursor:pointer;font-size:20px;display:none;justify-content:center;align-items:center;transition:opacity .3s;font-size:2rem;z-index:999999}.arrow-up:hover{background-color:#333}.arrow-up.show{display:flex}