My question: I couldn’t find a Custom-CSS-option in both the Septera and the Fluida-Theme.
Beside that, I really like these themes, but that’s a crucial point for me.
I’m using the Parabola-Theme on another Website, where this feature is included. Parabola also has a wonderful clearly arranged Settings-Backend with loads of adjustments and a lot of space to get a good overview. I think in Septera and Fluida it’s too much switching around to find what you need.