Colors in the Mailster Editor depend on the currently used template. Mailster scans the raw HTML and groups the same colors together.
This works only for 6-digit hex colors like #FFFFFF
If you’re using the short version #FFF Mailster will ignore this color and they cannot get changed via the options panel.
Merging Colors
If you use the same color for different parts in your template and save it Mailster will only recognize a single color. So changing the background color to #FFFFFF and the text color to #FFFFFF Mailster will not be able to separate them anymore.
To prevent that just use slightly different colors like #FFFFFF and #FFFFFE.