i dont really know how the backend or wtv works or if google docs externally opens the website inside of the document, but google drawings inside of docs is broken.
all the menus are light mode and the background is the standard white with grey dots (png). this could be worked on by making a dark mode version of the png tiles, inverting non coloured text (white & black) so it appears on the darker background, but keeping all the shape colours and stuff the same
proposed png background idea (works by inverting the colors)
unfortunately idk how to code so i have no idea how this would be actually implemented sorry :P