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HELP: Parallax Movement

Hi,
I just started using Webflow and I am not familiar with the platform. So I was watching the tutorial on Parallax Scrolling (https://www.youtube.com/watch?v=0ITA_pwfzDE&list=LL&index=9) and I was wondering how to make a grid like the one that apear on the video.


Here is my public share link: LINK
(how to access public share link)