.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gutter);
}
.grid-cell { display: block; }
.grid-cell img {
  width: 100%;
  aspect-ratio: 620 / 413;
  object-fit: cover;
  display: block;
}

@media (max-width: 900px) {
  .grid { grid-template-columns: 1fr; }
}