XF 1.5 how to edit text/background colour of status update and thread title boxes


I seem to have messed two things up in my customisation attempts, and I can't figure out how to fix them:

1. When drafting a status update, the text is white on white. How can I change the colour of the text in the status box?
2. When drafting a threat title, the title box turns black. How can I change the background inside the thread title box?

To clarify, both these issues exist only when drafting content. The content is readable once posted.

Thank you so much to anyone who can help; I'm a bit at wit's end.