CC/BCC fields have white backgrounds

[maguilara]

Describe the bug CC/BCC fields have white backgrounds, which makes it impossible to read or verify email addresses when typyting them by hand

To Reproduce (if applicable) Steps to reproduce the behavior:

1. Write or answer an email
2. Expand the CC/BCC field

Expected behavior Black background like the "To" field

Screenshots

Build information (please complete the following information):

• OS: Windows 10 latest 21H2
• Version: TB 91.4.0

Additional context Only other theme addon is "Dark Reader" but this still occurs even if addon is uninstalled.