Learning Interactions Editing Multiple Choice

Can someone please advise me on this…
I am using the learning interactions library & doing a multiple choice/multiple answer question.

I have the screen all set up EXCEPT I am not overly fond of the font size provided with the UI check box…I really need to make it twice the size at least.

I however am lost on what part of this needs to be edited to get the desired result as there is TONS of script there…is this easy? Hard? can someone enlighten me please?

Thanks!
Janet