#responsive-demo {
  grid-template-columns: 1fr 1fr 1fr 1fr;
}

@media (max-width: 991.98px) {
  #responsive-demo {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767.98px) {
  #responsive-demo {
    grid-template-columns: 1fr;
  }
}