Re: @alonaar:
The default color for handouts is white with the dark theme. However, the person who made the handouts would have to clear the color formatting on those handouts in order to make it work.
Sadly, there's not much I can do with CSS code to change it other than forcing the text color to always be white regardless of what the handout author intended, which would effectively remove functionality from the sheet.

I may consider adding support for the Stars Without Number character sheet. Right now, only 5e's Shaped and OGL sheets are supported.