Dark Mode is not applied across the UI

[Softvision-GeluHaiduc]

[Affected Versions]:

• Firefox Release 86.0.1
• Chrome 89.0.4389.82

[Affected Platforms]:

• Windows 10x64

[Prerequisites]:

• Make sure to be logged in as an admin on the hubs cloud instance.
• Have the Admin Panel opened.

[Steps to reproduce]:

1. Click the "App Settings" list item from the left side menu in the "Setup" section.
2. Click the "Theme" tab on the page.
3. Click the "Dark Mode" switch and save the changes.
4. Go to "https://svtesthub.com/" and observe the UI.

[Expected results]:

• Dark mode is applied across the UI.

[Actual results]:

• Dark mode is not applied across the UI, only on preferences.

[Notes]:

• Attached a screen recording of the issue below

┆Issue is synchronized with this Jira Task