.related-products {
  display: block;
}

.related-products__heading {
  margin: 0 0 3rem;
}

body.product .related-products__heading{
  text-align: center;
  font-size: 5rem;
}

@media screen and (max-width: 750px) {
  body.product .related-products__heading{
    font-size: 3rem;
  }
}