[cflsystems]

This will take more than just a simple css change with width. The reason you have this effect now is the block heights are different. You have to either make them all the same or close every row before next one starts. But if you do this you cannot have 5 in a row as this will fore 2 on 3 products on some screen sizes.
Easiest to make height on all product blocks the same but them you will face some of them having too much empty space