About cyan-50
#ECFEFF is cyan-50, a tailwind v4. This page shows its rgb(236, 254, 255) / hsl(183.16, 100%, 96.27%) / oklch(0.9841 0.0189 200.87) 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.