Also includes a second commit to clean up some trailing whitespace. Not passionate about that one, feel free to drop it if you don't want that change.
presenter display: fix notes view on Firefox
Gecko doesn't seem to infer the reduced margin the same way WebKit
does, but explicitly stating the -50% margin works correctly on both
presenter css: remove trailing whitespace
Doesn't this cause issues with other browsers? I'm asking naively, I didn't test it.
I tested Safari, Chrome, and Firefox. They all looked reasonable.
That said, feel encouraged to check my work before merging. I'd hate for it to be a "works on my machine" situation.
So, presenter view still looks good in Chrome and Safari, as well as (now) FireFox.
Finally got around to checking it out. Thanks!