Thanks, that helps. I can't for the life of me get the nubbin to change color though. It seems like
div.error-arrow should be the correct selector, and changing
border-left: 0.5rem solid color(var(--redish) blend(var(--background) 30%)); should result to something.
That said, I kinda get the feeling that setting
phantomCss in a color scheme is an uphill battle since you don't have any idea what the actual html will be like. It's kinda like theming for Atom, you just set the defaults and hope package devs don't make a mess of it. In this case I think I'll just let the default generated styles take care of themselves rather than waste time trying to tweak it to taste. It's not like it's ugly or anything, it's simple and neat as it is.