#061215

CSS

:root {
  --black-stallion: #061215;
  --black-stallion-rgb: 6 18 21;
  --black-stallion-oklch: oklch(0.172 0.019 214.8);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(192 56% 5%);
  border-color: oklch(0.172 0.019 214.8);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #061215;
  --color-black-stallion-50: #eff7f9;
  --color-black-stallion-100: #e1eaec;
  --color-black-stallion-200: #ccd6d9;
  --color-black-stallion-300: #adbabe;
  --color-black-stallion-400: #92a2a5;
  --color-black-stallion-500: #798a8e;
  --color-black-stallion-600: #667478;
  --color-black-stallion-700: #525d60;
  --color-black-stallion-800: #3b4446;
  --color-black-stallion-900: #292f31;
  --color-black-stallion-950: #161c1d;
}

SCSS

$black-stallion: #061215;
$black-stallion-rgb: 6, 18, 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);
}