About emerald-50
#ECFDF5 is emerald-50, a tailwind v4. This page shows its rgb(236, 253, 245) / hsl(151.76, 80.95%, 95.88%) / oklch(0.9793 0.0207 166.11) 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.