H3 Font Option Not in Site Styles

Site URL: https://www.blueridgeresearch.com

When I go to Site Styles and look at fonts, I do not see an option for Heading 3. It is just not there. See screen shot below. I am using the Burke template. Heading 3 shows in the text editor when I click into a text box but if I choose it, my text shows as tiny dots. I want to change it but it isn't in my site styles. Does anyone know how to fix this? FYI, my site is locked down for maintenance so you can't really view it. Any help is appreciated.