About neutral-700
#404040 is neutral-700, a tailwind v4. This page shows its rgb(64, 64, 64) / hsl(300, 0%, 25.1%) / oklch(0.3715 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.