#021111

CSS

:root {
  --black-stallion: #021111;
  --black-stallion-rgb: 2 17 17;
  --black-stallion-oklch: oklch(0.163 0.024 195.1);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(180 79% 4%);
  border-color: oklch(0.163 0.024 195.1);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #021111;
  --color-black-stallion-50: #eef7f7;
  --color-black-stallion-100: #dfeaea;
  --color-black-stallion-200: #c9d8d8;
  --color-black-stallion-300: #aabbbb;
  --color-black-stallion-400: #8fa3a3;
  --color-black-stallion-500: #758b8b;
  --color-black-stallion-600: #637676;
  --color-black-stallion-700: #4f5e5e;
  --color-black-stallion-800: #394545;
  --color-black-stallion-900: #27302f;
  --color-black-stallion-950: #151c1c;
}

SCSS

$black-stallion: #021111;
$black-stallion-rgb: 2, 17, 17;
$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);
}