#scrollToTopBtn {
    position: fixed;
    z-index: 995;
    bottom: 1.5rem;
    right: 1.5rem;
    padding: 0 0.5rem;

    font-size: 0.8rem;

    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

#scrollToTopBtn.visible {
    opacity: 1;
    visibility: visible;
}

#scrollToTopBtn .icon {
    position: initial;
    font-size: 1.8rem;
    padding-right: 0.2rem;

    vertical-align: middle;
}

#scrollToTopBtn:active {
    transform: translate(0, 2px);
}