I would have thought so to but looking at the white background digrams on the dark pages was a horrible experience. It pretty much defeated the entire purpose of having a dark mode as there was these bright white diagrams shining in my eyes.
The ideal solution would be to make all the diagrams twice but that's a ton of work if your site has lots of diagrams. Of course it's all an opinion. I don't have time to redo all the diagrams or go make them CSS styled indivdually so this is the solution I chose for now.
Which is better you can compare
Here's before dark mode
https://codepen.io/greggman/full/vYYOxjd
Here's leaving the backgrounds to the diagrams white
https://codepen.io/greggman/full/zYYGZWB
And here's the hue rotated solution
https://codepen.io/greggman/full/abbOJYB
The ideal solution would be to make all the diagrams twice but that's a ton of work if your site has lots of diagrams. Of course it's all an opinion. I don't have time to redo all the diagrams or go make them CSS styled indivdually so this is the solution I chose for now.