Responsive Gallery, with parallax scroll effect (at desktop breakpoint only)

I am trying to build a gallery page, which will feature a parallax gallery scroll at the Desktop breakpoint. Like the one Webflow featured here Parallax Movement on Scroll - Webflow interactions and animations tutorial - YouTube

I am looking for help with:

  1. creating a grid that resizes photos responsively, while maintaining aspect ratio of each photo
  2. what is the best way to set up a gallery for the flashier parallax scroll on desktop, but display more practically (single column or row) for mobile viewing

Here is my site Read-Only: