How do I decrease the column spacing between products on my Squarespace store page?

Hi there, can somebody please tell me how I can decrease the spacing between product columns on my Squarespace shop page to match the spacing between the product rows? 

I've set my column spacing to the minimum value allowed by the Squarespace editor but it is still too large. I would like for both columns and rows to have equal spacing - I've tried coding but with no luck!

If anyone has any code that would help I would really appreciate it 🙏

Hi,

If you share link to store page, we can help easier