.single-image img {
  width: 100%;
  height: auto;
}

.single-image.has-mobile-image .desktop-image {
  display: none;
}

@media (min-width: 45rem) {
  .single-image.has-mobile-image .mobile-image {
    display: none;
  }

  .single-image.has-mobile-image .desktop-image {
    display: block;
  }
}