.promo-card-grid__heading {
  text-align: center;
  margin: 32px 0 48px;

   @media (min-width: 750px) {
    margin: 48px 0;
  }
}

.promo-card-grid__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  
  @media (min-width: 750px) {
    grid-template-columns: repeat(2, 1fr);
  }

  @media (min-width: 990px) {
    grid-template-columns: repeat(3, 1fr);
  }
}