About yellow-400
#F7C900 is yellow-400, a tailwind v4. This page shows its rgb(247, 201, 0) / hsl(48.83, 100%, 48.43%) / oklch(0.8514 0.1742 92.04) 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.