No space between Name of sub-category and the Number of questions…

I noticed there’s no space between Name of sub-category and the Number of questions…

Where can I fix this?

Also, I’d like to show only the Sub-Categories list, not main categories, and I’d like to do adding some php script in a specific point of my page. I like the way they are currently display in single Category page.

Can you show the syntax please?

Thank you