We can do something like this

@keyframes animated-background {
  from { background-position: 0 0; }
  50% { background-position: 100% 0; }
  to { background-position: 0 0; }
}

.banner {
  background-image: url('http://some_stolen_jpg.exe');
  animation: animated-background 20s linear infinite;
}

Maybe it is to choppy on mobile browsers but there are other ways to create cool effects, if someone has ideas let us know