Formulas and diagrams in README not visible in dark mode

[aSemy]

Hi 👋

I've got GitHub dark mode enabled.

When I look at the README, I'm not able to view the diagrams and formulas.

• The formulas in the 'Math' column are black text on a transparent background
  
• I can see the blue/red arrows in the dataflow graph, but the text is also black
  

When I look at the dataflow graphs directly, because they are SVGs GitHub renders them with a transparent background

Suggestions

SVG Images

Here are my suggestions for improving the visibility of the SVG images:

• In the SVGs, add a white background (no more transparent backgrounds)

• Create two different SVGs, one for dark mode, and another for light mode. Apply the appropriate GitHub theme context CSS class to each image.

  Users can now specify the theme an image is displayed for in Markdown. Appending #gh-dark-mode-only or #gh-light-mode-only to the end of an image url will define whether it's only shown to viewers using a light or a dark GitHub theme.

  Here's an example of a commit adding support for light/dark logos)

Formulas

For the formulas I see that they are images that are referenced using the GitHub API

https://github.com/breandan/kotlingrad/blob/0.4.5/README.md?plain=1#L113

https://github.com/breandan/kotlingrad/blob/0.4.5/README.md?plain=1#L134

Perhaps the GitHub syntax might support dark mode? https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/writing-mathematical-expressions

Here are some examples:

Inline expression (using dollars): $\mathbf{A}(\mathbf{B})$

Block using $$:

$$\mathbf{A}(\mathbf{B})$$

Block using code fence math code fence block:

$$\mathbf{A}(\mathbf{B})$$

They look good to me! Screenshot of the above example