Attempt to use client's OS accent color as primary color

[emmnull]

Depending on feasibility, it could be nice to derive the primary color (and other primary-derived colors) from the client OS's own settings.

:root {
  accent-color: oklch(from highlight calc(l/2) calc(c*3) h);
}

Ressources

• https://stackoverflow.com/questions/62797493/how-can-i-use-the-macos-system-accent-color-in-css
• https://github.com/WebKit/WebKit/blob/13e79e2e2f09579997106164ae66ad5499fc0a27/Source/WebCore/css/CSSValueKeywords.in#L267
• https://developer.mozilla.org/en-US/docs/Web/CSS/accent-color#browser_compatibility