How do you edit content in Responsive HTML 5?

I am using Responsive HTML5 output in RoboHelp HTML 11. (12.0.3.428)

I used the Charcoal_Grey layout that came with the program. I want the output to reflect the Arial 11 pt font that is in the Style Sheet. I can see no way to change the content font in the layout. All content output seems to be Times New Roman 10 point.