@skinpores I think better way to do this animation is adding classes to elements (normal element position, and pseudo class for completed animation keyframes).
After that you need to create a page scroll trigger just use this service from @Finsweet team.
In my rough example, a combined version is presented (for animating smartphones, the interactions are used:
And to slide Section 1 to top, add a class to the element using a script generated in Finswit service:
Also on page added short CSS code for correct calculating height of section:
