#051011

CSS

:root {
  --black-stallion: #051011;
  --black-stallion-rgb: 5 16 17;
  --black-stallion-oklch: oklch(0.162 0.017 202.5);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(185 55% 4%);
  border-color: oklch(0.162 0.017 202.5);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #051011;
  --color-black-stallion-50: #f0f7f7;
  --color-black-stallion-100: #e2eaea;
  --color-black-stallion-200: #ccd6d8;
  --color-black-stallion-300: #aebabb;
  --color-black-stallion-400: #93a2a3;
  --color-black-stallion-500: #798a8b;
  --color-black-stallion-600: #677576;
  --color-black-stallion-700: #525d5e;
  --color-black-stallion-800: #3c4445;
  --color-black-stallion-900: #292f30;
  --color-black-stallion-950: #171c1c;
}

SCSS

$black-stallion: #051011;
$black-stallion-rgb: 5, 16, 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);
}