Tailwind red-500
#ef4444 — every format, its contrast behaviour, and the rest of the red scale.
#ef4444
Hex
#ef4444RGB
rgb(239 68 68)HSL
hsl(0 84% 60%)Background class
bg-red-500Text class
text-red-500Border class
border-red-500On white: 3.76:1 — large text / UI only
On slate-900: 4.74:1 — passes AA for text