How define text color in link dialog ?

Hello

I want black background for my ckeditor.
I do it with this parameter in my config file :
config.uiColor = 'black';

But with this parameter, my link pop display black text on black background.
I need to select text with mouse to read the text.

Is it possible to define the color text in the different dialog (like link pop up) ?
If yes, how can I do it ?

Best regards