Hi Laurel,
Wen creating the Click and Reveal element you can use the HTML Editor in the Revealed Content page element through which you can manage the font size.
See https://community.d2l.com/brightspace/kb/articles/3391-using-the-creator-features-of-brightspace-editor As notes:
Note: Creator+ elements are not logically isolated from the surrounding page and could be impacted by CSS rules on the parent page. The risk for conflicts is low when using Insert Element with custom CSS, however, D2l recommends testing Creator+ elements against your custom CSS frameworks.
Hope that helps!
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