Underground
Registry ID
GCR-2025-665A51
Issued December 7, 2025
Color data
HEX #665A51
RGB 102 / 90 / 81
HSL 26° / 11% / 36%
CMYK 0 / 12 / 21 / 60
opencolors.org/certificate/665A51
The registry ID is GCR, the year the color was named, and its hex.
Registry ID
GCR-2025-665A51
Issued December 7, 2025
Color data
HEX #665A51
RGB 102 / 90 / 81
HSL 26° / 11% / 36%
CMYK 0 / 12 / 21 / 60
opencolors.org/certificate/665A51
White text
6.67:1 · AA
Black text
3.15:1 · Fail
CSS
--underground: #665A51;
Tailwind
bg-[#665A51]
Token
{
"underground": {
"value": "#665A51"
}
}