Fix custom theme colors not applying due to outdated CSS selectors an…

[Ganeshbhargav]

Issue

Custom theme colors (primary/text) were not applying and remained black/white.

Cause

YouTube updated its internal CSS variables and DOM behavior.
The extension relied on the selector:
html[it-theme=custom]

However, this attribute is not consistently present, causing styles to never apply.

Fix

• Replaced selector with :root for global application
• Ensured style injection works regardless of attribute presence
• Added fallback and re-injection logic to handle YouTube dynamic updates
• Fixed masthead selector to remove dependency on custom attribute

Result

• Custom theme colors now apply correctly
• Works with latest YouTube UI
• Stable even during SPA navigation

Tested on

• Chrome
• Latest YouTube version

[rajanarahul93]

@Ganeshbhargav thanks for the pr!!
Can you please attach screenshots or a screen recording