.slider {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 500px;
    overflow: hidden;
}

.slide {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s;
    object-fit: cover;
    filter: brightness(.5);
}

.slide:first-child {
    opacity: 1;
}

@media (min-width: 1200px) {
    .slider {
        height: 650px;
    }
}