About red-50
#FEF2F2 is red-50, a tailwind v4. This page shows its rgb(254, 242, 242) / hsl(0, 85.71%, 97.25%) / oklch(0.9705 0.0129 17.38) 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.