.btn-scroll-top {
    position: fixed;
    right: 2rem;
    bottom: 1rem;
    width: 2.75rem;
    height: 2.75rem;
    text-align: center;
    color: var(--mdb-black);
    background: var(--mdb-primary);
    line-height: 46px;
    transition: 0.5s;
    z-index: 999;
}

.btn-scroll-top:hover {
    color: var(--mdb-light);
}