Certain parts of messages from Yahoo Groups are bright

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In messages from Yahoo Groups, certain elements are not dark. Here is a screenshot:

It appears to be just the footers inserted by Yahoo. The content from the actual message seems fine.

[maxigaz]

That's because those elements contain rules that specify that the background must be bright. They also contain CSS selectors specific to that email so it's impossible for me to change them individually.

As an alternative, I've tried inverting the colours of the whole message body with filter: invert(90%) that applies to all messages, but that makes the colour of certain text elements darker than ideal. I'll see if I can do something about it.

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@maxigaz Thanks for your effort. Let me know if you need more information.