Need Help Changing Header Fonts in Free Pagelines Theme!

Hi, I am using the free Pagelines theme – Platform. I am trying to figure out how to make my website header font and blog post title font different.

Pagelines Settings has an area to choose your fonts but it groups all headers under the same font. I would like to separate these.

I have posted style.css here https://pastebin.com/jwTXVGZS
website is fitrefresh.com

Thank you!