:root {
    --cd-back-to-top-margin: 50px;
}

@media (max-width: 992px) {
    :root {
        --cd-back-to-top-margin: 25px;
    }
}

.cd-top {
    position: fixed;
    bottom: var(--cd-back-to-top-margin);
    right: var(--cd-back-to-top-margin);
    display: inline-block;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
    z-index: 2;
}

.cd-top {
    opacity: 0;
    transition: opacity .3s, visibility .3s, background-color .3s;
}

.cd-top--is-visible {
    opacity: 1;
}

.cd-top--fade-out {
    opacity: .5;
}

.cd-top:hover {
    background-color: var(--cd-color-3);
    opacity: 1;
}