Change font color to default per template

[mp3president]

Hi,

I searched this forum and the [dot]com forum, but i could'nt find what i am looking for.
I am working with several templates (light and dark), but one of the templates is a very light version of purple and another is black.
Most people are using the black version on my board and can see lightblue as font color, but lightblue can't be seen on the light purple version.

So, my question:
I want to change the font color to default in some templates, but not all templates.
This means i cannot use the bbcode options, because these are forum related and not template.
I don't want to block some colors totaly.
Maybee i can put an extra line in "Additional CSS Definitions", is this a possibility?

Greetings Ron.