About gray-950
#030712 is gray-950, a tailwind v4. This page shows its rgb(3, 7, 18) / hsl(224, 71.43%, 4.12%) / oklch(0.1296 0.0274 261.69) 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.