[which is the best way to animate css background-position property?]

It work's perfect!! Thank a lot.

[which is the best way to animate css background-position property?]

I' m sorry, but i start using gsap, from a few days, so my question may be a little silly...
 
which is the best way to animate css background-position property?
 
I've tried doing:

TweenMax.to('.back', 8, {'background-position':300});

where '.back' is the element with background image.

.back {
  background: rgba(0, 0, 0, 0) url("img/seq2_0000.jpg") no-repeat fixed 0 0 / 200% 100%;
}

but what i'm tryng to get is a kind of 'seamless loop' in the background for example a sky and clouds horizontal moving.

 

Anyway GSAP is amazing!!!