Custom meta-data in composition mode

My eyes would love it if the font size or the background colour of the text boxes could be changed for custom meta-data in composition mode. I struggle to read the small black text against the grey. In normal mode, black text against a white background is fine (for me), teeny though the text is.

Apologies if this can be done already. I’ve searched like a maniac but can’t work out how to change this.

Same for me! Great idea.