Hi,
It depends on how you implemented those multiple choice questions.
You can see the general structure of any PennController element printed on the page here. You can also open your browser’s inspector to get a finer look at how the different elements are structured on the page and, most importantly, their CSS classes, and write rules accordingly in a file named global_z.css
Or you can directly use the css and/or cssContainer commands on your elements, if it makes sense with the particular way you implemented your multiple choice questions
Jeremy