.related-products {
  display: block;
}

.related-products__heading {
  text-align: center;
  margin: 0 0 3rem;
}
@media screen and (min-width: 990px) {
    .grid--4-col-desktop .grid__item {
        width: calc(25% - var(--grid-desktop-horizontal-spacing) * 3 / 4);
        max-width: calc(25% - var(--grid-desktop-horizontal-spacing) * 3 / 4);
    }
}