.why_grid-item {
  border-right: 1px solid var(--swatch--neutral-800);
  border-bottom: 1px solid var(--swatch--neutral-800);
}

/* Desktop - 4 columns */
@media (min-width: 992px) {
  .why_grid-item:nth-child(4n) {
    border-right: none;
  }
  .why_grid-item:nth-last-child(-n+4) {
    border-bottom: none;
  }
}

/* Tablet and below - 1 column */
@media (max-width: 991px) {
  .why_grid-item {
    border-right: none;
  }
  .why_grid-item:last-child {
    border-bottom: none;
  }
}