I found a tutorial that helped me finally get the font sizing right - at least it almost did. I'm having to resize all my fonts to work on the mobile site. I was able to change my h3 font size with the following code in the screenshot below. Still following the tutorial to a tee, I tried changing the paragraph font size next. I have tried "p" and "p3" and neither change the size of the font (both of the fonts above and below "YOUR WEDDING VIDEOGRAPHER" are p3.
I must be doing something wrong, but I'm not sure what since it worked for the person in the tutorial. Here is the tutorial I'm watching. Skip to 1:18