You can write your own handler that rendering the content area. (https://world.episerver.com/documentation/class-library/?documentId=cms/7.5/C2943161)
Read more about it here in the blog by the great @valdis!
Hi, I want to add a CSS class to the wrapping div of all ContentAreas. To do this with one ContentArea is easy:
The problem with this solution that I have to add this to all content areas in all views. Is there a better way to do this?