.img-grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (min-width: 768px) {
  .img-grid-item:first-child {padding-left: 0;}
  .img-grid-item:last-child {padding-right: 0;}  
}
@media (max-width: 767px) {
  .row {row-gap: 20px;}
}