Adjust Font Size and Colors of Rich Text with Image Section - Prestige Theme

[Riig]

Hello- I'm trying to increase the font sizes and font/background colors for a particular section on my homepage. 

The section type is Rich Text with Image, screenshot below.  I would like to adjust these characteristics for this specific section only and not have them apply to other Rich Text with Image sections within the site.

Trying to increase font sizes and change font colors for the Heading and Text areas (listed terms), and also change the background color from white to something different.

https://riigfishing.com

Thanks very much for any assistance!

[Riig]

Thanks but that won't do it unfortunately.  I'm looking to increase heading sizes beyond what the in-app selector allows, and changing the text size via this method also changes text across the site, which is what I don't want. (footer text, etc.)

I'm assuming I will need a css code fix that will apply to a specific section ID.