Switching between dark mode and normal mode doesn't change the background color

Summary

Switching between dark mode and normal mode doesn't change the background color

Steps to reproduce

  1. Open https://gitlab.com/profile/preferences
  2. Switch to Dark mode
  3. See the background will not change
  4. Reload the page
  5. Now switch to normal mode
  6. Still, it will be in dark mode except the navbar

Relevant logs and/or screenshots

https://www.loom.com/share/8e21a0a854cd44588fb3853f9a02dd59

Output of checks

This bug happens on GitLab.com