.gallery {
  display: flex;
  flex-wrap: wrap;

  img {
    width: calc(100% / 3);
    object-fit: cover;
    aspect-ratio: 1 / 1;
  }
}

@media screen and (width >= 768px) {
  .gallery {
    img {
      width: calc(100% / 4);
    }
  }
}

@media screen and (width >= 1280px) {
  .gallery {
    img {
      width: calc(100% / 6);
    }
  }
}