#0B0808

CSS

:root {
  --black-sheep: #0b0808;
  --black-sheep-rgb: 11 8 8;
  --black-sheep-oklch: oklch(0.139 0.006 17.8);
}

.element {
  color: var(--black-sheep);
  background-color: hsl(0 16% 4%);
  border-color: oklch(0.139 0.006 17.8);
}

Tailwind CSS v4

@theme {
  --color-black-sheep: #0b0808;
  --color-black-sheep-50: #f7f4f4;
  --color-black-sheep-100: #eae7e7;
  --color-black-sheep-200: #d6d3d3;
  --color-black-sheep-300: #bab6b6;
  --color-black-sheep-400: #a29d9d;
  --color-black-sheep-500: #8a8585;
  --color-black-sheep-600: #757070;
  --color-black-sheep-700: #5d5a5a;
  --color-black-sheep-800: #444242;
  --color-black-sheep-900: #2f2d2d;
  --color-black-sheep-950: #1c1a1a;
}

SCSS

$black-sheep: #0b0808;
$black-sheep-rgb: 11, 8, 8;
$black-sheep-light: mix(#fff, $black-sheep, 20%);
$black-sheep-dark: mix(#000, $black-sheep, 20%);

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