section.cards-grid{
    display:grid;
    grid-template-columns:  repeat(3, 2fr);
    grid-gap:2em;
  }

  @media only screen and (max-width: 600px) {
    section.cards-grid{
      display:grid;
      grid-template-columns:  1fr;
      grid-gap:2em;
    }
  }