.collapse .slick-slider:not(.slick-is-ready),
.collapsing .slick-slider:not(.slick-is-ready) {
    opacity: 0;
}

.collapse.show .slick-slider.slick-is-ready {
    opacity: 1;
    transition: opacity 0.2s ease;
}

.slick-list {
    overflow: hidden;
}