My default background color for text fields on my PC is a light blue.
The fields where you enter your domain, email, and password
on the Client Login page use a light gray foreground color
(#CCC, specified in the CSS).
Alas, this combination makes the text nearly invisible,
as you can "see" on the left side of the image below.
I don't know what the standard background color is,
I've been using this light blue for years.
The fix for this is dead-easy, and won't take but a minute of someone's...
Client Login page colors