I was having a conversation on one of the questions with a member of stackoverflow.com
and I came across to edit my message and after clicking on edit I was presented with this.
You can see that the text inside the message box isn't visible at all and it's really hard to edit a message.
It would be good if we can update the section to change the font color or the bg-color at least when the edit button is clicked.
EDIT
I was using Chrome Version 66.0.3359.139 (Official Build) (64-bit)
at the time I was having the chat, and I don't have any themes installed in the browser.
private-messaging
tag relevant to it?