Edublogs / Edu-Clean Theme - Font size issue

Hi,
This has been bugging me for a little while. I change the font size in the theme options in the css tab area. It changes some of the font sizes but the 'paragraph' sized fonts stay the same at about a 10pt. It's to small and makes it less appealing visually not to mention harder to read.

How can I change this? Preferably in the child theme.

Thanks!