.custom-image {
    background: black;
    color: white;
    text-align: center;
    padding: 20px 0;
    margin: 0;
    width: 100%;
}

.image-gallery {
    display: grid;
}

.image-item {
    position: relative;
}

.image-item img {
    width: 100%;
    height: 100%;
    height: auto;
    display: block;
}

.image-item::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1;
    transition: opacity .3s;
    opacity: 1;
}

.image-item:hover::after {
    opacity: 0;
}

@media (min-width: 960px) {
    .image-gallery {
        grid-template-columns: repeat(5, 1fr);
    }
}