About gray-100
#F3F4F6 is gray-100, a tailwind v4. This page shows its rgb(243, 244, 246) / hsl(220, 14.29%, 95.88%) / oklch(0.967 0.0029 264.54) 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.