Huh, well it figures that it isn't an easy problem to solve.

EDIT: I was looking at the wrong. I see, it seems like a nifty way to combine styles. But hmm, I guess this one of those things that what works for you, is good enough.

Somehow keeping the styles in the same file, inside the styled components, just makes everything easier to me. Granted the string interpolation is bit annoying at times for accessing the theme variables but ehh.