#041615

CSS

:root {
  --black-stallion: #041615;
  --black-stallion-rgb: 4 22 21;
  --black-stallion-oklch: oklch(0.184 0.025 190.6);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(177 69% 5%);
  border-color: oklch(0.184 0.025 190.6);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #041615;
  --color-black-stallion-50: #edf8f7;
  --color-black-stallion-100: #dfebea;
  --color-black-stallion-200: #c9d8d7;
  --color-black-stallion-300: #a9bcbb;
  --color-black-stallion-400: #8ea3a2;
  --color-black-stallion-500: #748c8a;
  --color-black-stallion-600: #627675;
  --color-black-stallion-700: #4e5f5d;
  --color-black-stallion-800: #394544;
  --color-black-stallion-900: #27302f;
  --color-black-stallion-950: #151c1b;
}

SCSS

$black-stallion: #041615;
$black-stallion-rgb: 4, 22, 21;
$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);
}