Category Shortcode – Possible to display results in 2 columns?

I am currently using this shortcode: [CATEGORIES COUNT=”yes”] on a page to create an index of categories.

It works perfectly, I just want to make a design change:
Currently it is displaying the list of categories in 3 columns and I would like to make it 2 columns to fit my page better.

Can I do this with CSS in the Custom Meta Data (Design Setup) area, or can I use html on the page itself to achieve this? (If so how?)

Any advice is appreciated.