Unknown property 'scrollbar-color' and 'scrollbar-width'

[aesophor]

Describe the bug: The scrollbar is not themed anymore. I navigated to the theme editing page in stylus and found these two issues:

Expected behavior: Maybe the scrollbar is supposed to be themed like in previous versions?

Where did this happen: Theme editing page (in stylus)

Steps to reproduce:

1. Install github-moonlight 2.10.10
2. Scrollbar is not themed
3. Navigate to theme editing page (in stylus) and these issues will be displayed.

Screenshots: .

Desktop (please complete the following information):

• OS: Linux (5.4.28-gentoo)
• Browser: Firefox

• Version: 74.0 (64-bit)

  Additional add-ons installed:

  • Dark Reader (disabled on github)
  • HTTPS Everywhere
  • NoScript
  • Privacy Badger
  • uBlock Origin
  • Video DownloadHelper
  • Youtube Audio

[Brettm12345]

https://developer.mozilla.org/en-US/docs/Web/CSS/scrollbar-color