Outbox has the wrong font colour when active

[GretaD]

Steps to reproduce

1. Open mail app
2. Have at least one message on outbox
3. Click outbox

Expected behavior

It has the same font colour as other mailboxes

Actual behavior

It has a white colour on default theme

Mail app version

lastest

Mailserver or service

No response

Operating system

No response

PHP engine version

None

Web server

None

Database

None

Additional info