Nice work! I like the colour scheme, the shortcuts and customizability.
Some suggestions:
1. I think the onboarding process could be a bit better. I initially added a blank board then got confused. Perhaps a new user can start off on the tutorial board rather than going to Add Board > clicking Tutorial.
2. I thought the Tutorial board was a bit too wordy. I think functionality for power users (shortcuts and the like) should belong to another page and shouldn't be on the Tutorial board.
3. Perhaps add tooltips or hints for the "Header Class", "Header Style", "List Class" and "List Style" fields. This way I can learn how to use them without navigating away
