[llvm] [llvm-cov] Add HTML dark theme support (PR #93080)

[via llvm-commits]

EdJoPaTo wrote:

Going to more pastel colors on bright requires different colors for bright / dark. With my changes I tried to have minimal differences based on the theme (`@media (prefers-color-scheme: dark)`) and worked with semi-transparent colors above the background. The dark theme requires darker colors with more contrast while the bright theme would work with less. Changing that would be possible but requires more differences based on the actual theme.

I like the pastel ones a bit better too, but that would result in more lines of style sheets. So I went for simplicity on my current approach.

https://github.com/llvm/llvm-project/pull/93080