How do I change the default colors for background and text for Thunderbird email?

I can easily change the colors on individual emails but I need to change the default and have checked all the Tools, Options, Page colors, Text, etc. choices and still get the original default of white background and black text. What am I missing?

If you can tell me how can i access Thunderbird email, i think i can answer your question

002-06 Anterior Surgical Implant Placement: Single Missing Tooth PREVIEW

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