Board Thread:Support Requests - Getting Technical/@comment-26569706-20190519144600

Is it possible to customize the font of every heading and sub-heading 1 on a wiki using CSS or JS? On my wiki, I'm looking to change all those headings to the Open Sans font, but I do not know how to do that.

And this is the sub-heading I'm talking about
Thanks for your help!

-JK55556 