.sponsors {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  padding: 8rem 0 2rem 0;

  a {
    height: 2rem;
    margin: 2.25rem 1rem 1rem 1rem;
    
    img {
      width: 100%;
      filter: grayscale(100%);
    }
  }

}

@media only screen and (max-width: 600px) {
  .sponsors {
    grid-template-columns: 1fr 1fr;
    padding: 4rem 0 2rem 0;

    a {
      padding: 0;
      margin: 1rem 0 .5rem 0;
    }
  }
}