BTW I think there's a (long standing) issue with your CSS: I'm always writing black on dark gray when I'm on Firefox under KDE with the Breeze Dark theme, and I

BTW I think there's a (long standing) issue with your CSS: I'm always writing black on dark gray when I'm on Firefox under KDE with the Breeze Dark theme, and I think it's because you probably specified a black foreground color for form elements, and assumed the background to be always white (it isn't!)...