Stacking rows in a column of a grid while ignoring height in other column

I’m attempting to make a grid behave differently on desktop and mobile.

  1. On desktop I want the column 1 to be stacked, ignoring the height of the rows in column 2
  2. On mobile I want all content stacked sequentially.

Right now #3 is driven by the height of #2

Thank you for your help!


Here is my site Read-Only: LINK