Sunspot title and tag line

I am fairly new at using WP but am learning. I just installed Sunspot theme but am having trouble with the Title and Tagline. I need to reduce the size of the font but don’t know how to do it. Is it possible? I am not too good with html at this time…so not sure I want to try changing it in code.

theme I had was 2014 but decided to try Sunspot. In 2014 the font is quite small but adequet. but its huge with Sunspot. Any way to fix that?
thanks for any input or advice any one might have.

Here is a link to my site: https://urbangardennatives.com/
cindy