Scrolling Effect on Kanye West's Website Looks Cool. How Does it Work? (Javascript)

I'm trying to figure out how the scrolling effect on works.

onPageLoad a video pushes down the content and well ... it looks quite cool.

I've got something working:

But I haven't managed the neat scrolling effect. Grateful for any advice?

If you're confused by what I mean go on the to see the effect.


Add a keyframe animation to the element that scrolls down. Transform/move it up by 100vh (or whatever value) initially and then trigger the animation to go back to zero once the video is loading.

Legend. Thanks Pug. All Working