.container-gal {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    grid-auto-rows: 150px 200px;
    gap: 2px;
}

.container-gal .item {
    width: 100%;
    overflow: hidden;
    background: #000;
}

.container-gal .item:nth-child(6),
.container-gal .item:nth-child(7),
.container-gal .item:nth-child(8),
.container-gal .item:nth-child(12) {
    grid-row: span 3;
}

.container-gal .item:nth-child(18) {
    grid-column: span 2;
    grid-row: span 2;
}

.container-gal .item:nth-child(17) {
    grid-column: span 1;
    grid-row: span 2;
}

.container-gal img {
    opacity: 0.7;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.15);
    transition: transform 0.5s, opacity 0.5s;
}

.container-gal img:hover {
    opacity: 1;
    transform: scale(1.03);
}

@media only screen and (max-width: 600px) {
    .container-gal {
        display: grid;
        grid-template-columns: none;
    }

    .container-gal .item:nth-child(6),
    .container-gal .item:nth-child(7),
    .container-gal .item:nth-child(8),
    .container-gal .item:nth-child(12),
    .container-gal .item:nth-child(18),
    .container-gal .item:nth-child(17) {
        grid-row: 1;
        grid-column: 1;
    }
}