Otto, Thanks for the super quick response.
So what if “every” post has a containing div, and thats what Im trying to change via styles in my css with post_class?
Because how I have it right now is, Im giving my featured posts a specific category > the posts with those specific featured category names have their own CSS styles, ie. .category-featuredblog, .category-featuredworks, etc. So depending on what category I choose I have a different background image thats instantiated in that containing div according to my new css rules Ive created.
But for the default post ie. .post, I guess Im missing the point of what I should be amending in my css since I already have specific rules for each category + .post?
I’ll give that css specificity a google search though like you recommended, hopefully that will be the answer.