Presentation and Poster use different colors

E.g.

	Presentation	Poster
name	scadslightgrey	scadsailightgray
HTML color code	DADADA	e3e3e3

Note: Not only scads changes to scadsai, but also grey to gray, as well as the HTML color code.

My suggestion would be to put the colors in a separate file that is included in each *.cls.