Compact view: Insufficient contrast for checkbox and unread marker

[nimishavijay]

Steps to reproduce

1. Open Mail
2. Go to settings and select compact mode
3. Open an unread message

Expected behavior

The checkbox and the unread marker should have sufficient contrast with the background (should be --color-main-background)

Actual behavior

Mail app version

No response

Nextcloud version

No response

Mailserver or service

No response

Operating system

No response

PHP engine version

None

Nextcloud memory caching

No response

Web server

None

Database

None

Additional info

No response