About zinc-700
#3F3F46 is zinc-700, a tailwind v4. This page shows its rgb(63, 63, 70) / hsl(240, 5.26%, 26.08%) / oklch(0.3703 0.0119 285.81) 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.