.banners-differentials {
  margin: 2% auto 0 auto;
}

.banners-differentials #desktop {
  display: block;
}

.banners-differentials #mobile {
  display: none;
}

@media (max-width: 768px) {
  .banners-differentials #desktop {
    display: none;
  }
  .banners-differentials #mobile {
    display: block;
  }
}

.banners-differentials img{
  width: 100%;
}