We use a pre-set theme that uses the font Lato 16. However, this font only shows up in the response options; the questions use a different font in a smaller size. I can edit each question and change the font manually, but is there a way to apply Lato 16 to all of the questions as well as to the response options so the survey has a consistent look?
I think the following document should get you started:
Hope this helps!