Change H1 Tag for Posts Title

Hi,

Firstly, thank you for reading and I apologize if I posted this in the wrong section.

I am having a painful issue with a website I’m building. If you go to my website you will see that all the H1 tags have background-color: black; BUT I’m trying to remove the black background from ONLY Posts (articles, blog posts…whatever you want to call them). Obviously when I remove the CSS from the H1 tag it removes it from all H1 tags but this isn’t want I want to do. I want to, if possible completely change the Header tag for Posts so I can customize it. I hope that makes sense because I’m completely lost. I searched my child theme, found the header tags in my style.css but I don’t know where I could change the header tags for the Posts. I would be fine with changing it to H2. So how do I change the header tag for Posts (Title)?

Theme- Daily Dish Pro (child) this is a Genesis Framework (parent) theme.

Website: https://physiqonomics.com/

Post: https://physiqonomics.com/mushin-no-state/

Thank you!

Steven