Formatting H2 text and changing the font sitewide

Hi there,
I’ve looked around and can’t find anyone else with this issue. Just switched to the Unconditional theme and I’ve made a few changes, but I’m still running into a formatting problem that I just can’t seem to resolve.

I have an image that should be right-aligned with the text below it and it is, at least with the standard paragraph text. The problem is that I have a small block of H2 text that keeps coming up below the image. I’m fairly new to HTML and CSS, but I’ve tried to see if I can change it in either the text editor or the style sheet, with no success.

Also, I’d like to change the font across the site. I changed it in the style sheet, but it doesn’t seem to have had an effect anywhere. Any advice will be very much appreciated.

I’m using a downloaded child theme, if that helps at all.

The specific post that I’m trying to format is:
https://gardeningonmars.com/?p=1048