2 Columns blocks in tablet screen size (FLUID ENGINE)

Hey, 

How do I get my 4 code blocks (that are in one row on desktop size) to be spread in, 2 rows with 2 blocks, in smaller screens and tablet view (not mobile as I can customize that). 

so I have 
1 2 3 4

and I would like to have 
1 2
3 4

I tried to change the fluid engine grid-template-columns but that didn't work as I change the fluid engine columns. 

Thanks in advance!

Can you share link to page where you have problem? We can check code easier