#182121

CSS

:root {
  --black-stallion: #182121;
  --black-stallion-rgb: 24 33 33;
  --black-stallion-oklch: oklch(0.239 0.013 196.3);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(180 16% 11%);
  border-color: oklch(0.239 0.013 196.3);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #182121;
  --color-black-stallion-50: #f1f6f6;
  --color-black-stallion-100: #e3e9e9;
  --color-black-stallion-200: #ced6d6;
  --color-black-stallion-300: #b0b9ba;
  --color-black-stallion-400: #96a1a1;
  --color-black-stallion-500: #7d8989;
  --color-black-stallion-600: #6a7474;
  --color-black-stallion-700: #545d5d;
  --color-black-stallion-800: #3d4444;
  --color-black-stallion-900: #2a2f2f;
  --color-black-stallion-950: #181b1b;
}

SCSS

$black-stallion: #182121;
$black-stallion-rgb: 24, 33, 33;
$black-stallion-light: mix(#fff, $black-stallion, 20%);
$black-stallion-dark: mix(#000, $black-stallion, 20%);

.element {
  color: $black-stallion;
  box-shadow: 0 0 0 2px rgba($black-stallion, 0.35);
}