@media screen and (min-width: 749px) {
  .desktop_images.media {
    display: block;
  }
  .mobile_images.media {
    display: none;
  }
}

@media screen and (max-width: 749px) {
  .desktop_images.media {
    display: none;
  }
  .mobile_images.media {
    display: block;
  }
}