#001012

CSS

:root {
  --black-stallion: #001012;
  --black-stallion-rgb: 0 16 18;
  --black-stallion-oklch: oklch(0.158 0.027 203.9);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(187 100% 4%);
  border-color: oklch(0.158 0.027 203.9);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #001012;
  --color-black-stallion-50: #edf7f9;
  --color-black-stallion-100: #deebec;
  --color-black-stallion-200: #c8d8da;
  --color-black-stallion-300: #a8bcbe;
  --color-black-stallion-400: #8da3a6;
  --color-black-stallion-500: #728c8e;
  --color-black-stallion-600: #617678;
  --color-black-stallion-700: #4d5f60;
  --color-black-stallion-800: #384546;
  --color-black-stallion-900: #263031;
  --color-black-stallion-950: #141c1d;
}

SCSS

$black-stallion: #001012;
$black-stallion-rgb: 0, 16, 18;
$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);
}