I'm trying to test out a scroll hijacking method I saw on http://www.adidas.com/us/climazone. On that page, they have a fixed position container with everything in it absolutely positioned and on page scroll they translate3d the elements up -Y scroll position which I can do but they key ingredient they add is easing to that scroll tracking. So as you scroll the elements follow "recreating the scroll effect" but upon release slowly ease into their final place which is the end Y scroll position.
I've added a link to my current CodePen example with my starting point, any help achieving/deconstructing what Adidas Climazone is doing to add easing to their scrollY transforms would be eternally grateful! Another demo I did on JSFiddle is here: https://jsfiddle.net/416ne38h/5/
Bonus if I can use GSAP for this!