QR code not detected on Dark Mode #2925

Describe the bug
I am not able to configure 2fa scanning the QR code on Dark Mode, it is not picked up by my apps (Authy/Bitwarden).
It works ok on Light Mode, or manually copying the link.

Steps To Reproduce
Steps to reproduce the behavior:

1. Go to 'Edit Profile' when on Dark Mode
2. Click on 'Multi-Factor Authentication -> Configure Methods -> Reconfigure (TOTP)'
3. It shows the QR but it is not detected when scanning

Expected behavior
I should be scanned correctly

Screenshots
No screenshots

Your Configuration (please complete the following information):

• Exact BookStack Version (Found in settings): v21.08.3
• PHP Version: 7.4
• Hosting Method (Nginx/Apache/Docker): Nginx (reverse proxy)+ Apache

Additional context
I'm guessing that it needs more contrast with the page background, if I do that it works.