About sky-50
#F0F9FF is sky-50, a tailwind v4. This page shows its rgb(240, 249, 255) / hsl(204, 100%, 97.06%) / oklch(0.9771 0.0125 236.62) 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.