.img-grid {
  column-count: 2;
  column-gap: 1.5rem;
}
.grid-img {
  display: block;
  break-inside: avoid;
  margin: 1.5rem 0;
}

.grid-img:first-child {
  margin-top: 0;
}

@media (max-width: 600px) {
  .img-grid {
    column-count: 1;
  }
}