Posts Module Layout Question

I’m currently using BB with the BB theme, and I’m trying to have a posts module that displays a 5x2 layout of post featured images (5 posts wide, 2 posts height). However, some other computers display 2 rows of 4 posts each, and then there’s another row at the bottom with the remaining two posts. I can actually recreate this by making the width of my browser smaller. Is there any way I would be able to make the desired 5x2 layout display properly on all computers, regardless of the dimensions of the browser?