.desktop-banner {
  display: block;
  width: 100%;
  height: auto;
}

.mobile-banner {
  display: none;
}

@media (max-width: 768px) {
  .desktop-banner {
    display: none;
  }

  .mobile-banner {
    display: block;
    width: 100%;
    height: auto;
  }
}