About neutral-950
#0A0A0A is neutral-950, a tailwind v4. This page shows its rgb(10, 10, 10) / hsl(0, 0%, 3.92%) / oklch(0.1448 0 0) values, WCAG contrast against black and white, an OKLCH tint-and-shade ramp, and complementary, analogous, and triadic harmonies — all computed in perceptually-uniform OKLCH.