Creating Checkerboard with icon and text that works on both desktop and mobile

Hi. I am new to SquareSpace and probably just made a huge rookier move - creating a design in XD, getting approved by the client and now realising it might be harder to execute. Pic below. I want to create a checkerboard grey and white grid - 2 across and 3 down. Each individual grid will have a little icon (to I add this to the background or add as an image) then a title and some body text. It needs to read as two across on a desktop or tablet and then stacked on a mobile. Any advice about the best way to build it in SS would be amazing and thank you!

Hi. Do you still need help on this? 

Can you achieve this on desktop? Then we can give the code to achieve correct order on tablet/mobile.