Tailwind gray-900
#111827 — every format, its contrast behaviour, and the rest of the gray scale.
#111827
Hex
#111827RGB
rgb(17 24 39)HSL
hsl(221 39% 11%)Background class
bg-gray-900Text class
text-gray-900Border class
border-gray-900On white: 17.74:1 — passes AA for text
On slate-900: 1.01:1 — decoration only