puzzle-relative paths for custom css don't work

[Vroo]

As far as I can tell, if it doesn't start with https, it is always interpreted as a path relative to the resources folder not to the puzzle folder.

The page itself says to use a leading $ but that does not works nor does the presence or absence of a / affect it (as described in https://github.com/PuzzleServer/mainpuzzleserver/wiki/Event-Customization which has a complicated explanation). I suggest updating to say start with $/ rather than just $ after it's fixed.