Improve anchor contrast for dark theme

[jermanuts]

On page https://eylenburg.github.io/android_comparison.htm

Would also need a color to fit on black background as this is an anchor link

basically need a color with good contrast for green, red, yellow, and black. Obvious fix here is to add a class specific to some of them as you wont find a color that fits all of them well.

[eylenburg]

That's strange, I'm getting a contrast of 4.15 (not perfect but not as bad)

edit: it appears to be an issue in dark mode though, so you're right