.btn-check:checked+.btn, .btn.active, .btn.show, .btn:first-child:active, :not(.btn-check)+.btn:active {
    color: white !important;
    background-color: #353535 !important;
    border-color: #353535 !important;
}

.btn-check:checked+.btn .buttonlist-hidden {
    display: block !important;
}

.buttonlist-hidden {
    display: none;
}

.buttonlist-hidden img {
    height: 24px;
}