How did they do that?

Question:
Can anyone explain how the 4-tile section on this template was built?
Specifically, how did they add the effect that makes the tiles slide up into place as you scroll.

Product:
Wix Studio

What are you trying to achieve:
[Explain the details of what you are trying to achieve. The more details you provide, the easier it is to understand what you need.]

What have you already tried:
[Share resources, forum topics, articles, or tutorials you’ve already used to try and answer your question.]

Additional information:
[Include any other pertinent details or information that might be helpful for people to know when trying to answer your question.]

You can use “edit template” on the top-right to get into the editor and see its design.

Sticky position on each of the 4 tile elements.