I’ve spent the last few hours trying to find work-arounds to adjusting basic css properties like font-size using custom classes because it doesn’t work. The only implementation I’ve been able to sort out is to edit the rich-text-text GLOBAL class, which, of course, applies the css property to every single text element.
The only text properties I can edit by custom class look to be properties that aren’t included in the design panel like text-transform. This is not what I was expecting.