:root {
    --grey-gray-2: #DDD;
}

.back-to-top {
    display: flex;
    align-items: center;
    width: 56px;
    height: 56px;
    padding: 12px;
    background: var(--grey-gray-2);
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    border: unset;
    bottom: -80px;
}
.back-to-top:hover, .back-to-top:focus {
    background: var(--grey-gray-2);
}