Heard my downstairs neighbor talking about their compost bin smelling

I was taking out my trash yesterday and overheard the guy in 2B telling the super his compost bin was attracting fruit flies. He said, 'It's just a plastic tub with holes, I thought that was enough.' It made me realize I've been doing the same thing with my own setup. I've been adding food scraps to a bucket without enough browns, just assuming the holes would handle it. Has anyone found a good ratio of shredded paper to food waste that actually keeps the smell down in a small space?