Dark mode problems

Hi guys, I currently have this problem with dark mode and rich text block on my blog post
You can see in the image below that my text color stays the same when in dark mode. I can change the text color fine with paragraphs and other elements but I have no idea when it comes to rich text blocks.

Many thanks, this is my only view link.

one more thing the dark mode is a feautre we have on our web, not some gg chorme extension