feat/tup-634: Migrate pseudo-elements to core-cms

[R-Tomas-Gonzalez]

Overview

Migrate pseudo-elements to core-cms.

Related

• TUP-634
• Migrate from pseudo-elements

Changes

• Added folder for generics
• Added pseudo-element to generic folder

Testing

Use the target pseudo-element on a div to see the interaction

UI

[wesleyboar]

P.S. I know the focus outline does not show above the section being focused. That's a bug I am not sure how to fix. (I think I'd need to add margin atop cols, but then I have to do other stuff to prevent changes to negative space across the website.) Ideas welcome.