Need help to modify section classes in Airspace Theme

I am trying to build a website using the Airspace Template Theme ( ) and I am desperately searching for a way to modify the style of the text written inside the different section on the homepage. Can somebody tell me where I can find the files which modify not only the text but also the font, letter size and bolt/italic of e.g. the “ABOUT US” section?

I would be really glad if somebody could help me out.

edit: I should maybe mention that I am able to change the text through the homepage.yml file and can change the indentation and spacing through the templates/_about.scss file but i am unable to change the style of the text itself.

Best regards