Visual Style effect Excel colors?

[NewYears1978]

I am using AppowsWork Theme and my wife told me when using excel it changes the default Font color (in the colors selector box) from black to grey 75,75,75..

Anyone know where this setting is or is there a way to make Excel specific settings?  She doesn't want it to use this color by default..but black as it should.

I searched for 75,75,75 color in Style builder but unfortunately that color is used 100's of times.