Use same margin all around note-book-card

[meichthys]

There might be a reason why, but the margins between the note-book-cards are not uniform.

Current:

Adjustment:

[zadam]

Thanks, but please try to avoid those whitespace changes, they obscure the real diff.

[meichthys]

@zadam Sorry about the whitespace - that was dev.github.
I'll try pushing from my local machine next time 👍