Background overlay gradient behind text with background image

I thought this would be simple for me to figure out, but it is not.

My CSS skills are limited and when I view the code (in my browser) I can’t tell which classes I should use to format certain specific things.

On this page:
https://2p4twjkbl5.papa-view.com/

I would like to have a black gradient behind the white text and also be able to format the text. I’ve tried a few CSS things which haven’t worked.

I’ve searched the forum in as many ways as i can think of, have watched youtube videos about Enfold and of course started with Enfold documentation. Enfold is a great theme, but I cannot find a way to do these simple things.

Any help or pointing me to resources would be appreciated.