[Burning Wheel] Sheet font is too big on Firefox (+ Linux?)

Changing font size from em to rem seems to do the trick, but most of the default text seem to overflow the space provided for it from the outset. I could verify if this is Linux specific or not later, but I think using rem is a good change, regardless.

1. Could you provide screenshots before/after example? 2. And when you changed from em to rem, did you do this with browser developer tools? 3. Did you make a straight em to rem change, or did you change any values? 4. What's your exact operating system? Ubuntu, Linux Mint, or something else? You use some pretty recent version of firefox? Could be something good to know.

Quick answers, as I can't get a screenshot until later tonight: 2. Yeah, I just directly edited the css during play 3. No value change in the final version. I originally tried reducing the font from something like 1.2em to 1em (I cannot recall the exacts), but it didn't seem to workout until I used 1.2rem. 4. Arch Linux, mostly up to date, though maybe not on the absolute latest version at the time