[Suggestion] Dark mode
It seems that dark mode in Zotero (in all platforms) looks like a `CSS` filter `invert()`. But, doing so makes it more contrasting and hard to read while in full brightness. Instead of just `filter: invert()`. I want to propose a more friendly filter as `filter: invert(64%) contrast(228%) brightness(80%) hue-rotate(180deg)`.* Any thoughts?
* Taken from (see preview): https://github.com/mozilla/pdf.js/issues/2071?ref=9iw5q4#issuecomment-830446509
* Taken from (see preview): https://github.com/mozilla/pdf.js/issues/2071?ref=9iw5q4#issuecomment-830446509