.museum-gallery {
    position: relative;
    padding: 80px 40px;
    background-size: cover;
    background-position: center;
}

.museum-gallery::before {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,.8);

}

.museum-gallery>* {
    position: relative;
    z-index: 2;
}