#003F0F

CSS

:root {
  --realm-of-the-underworld: #003f0f;
  --realm-of-the-underworld-rgb: 0 63 15;
  --realm-of-the-underworld-oklch: oklch(0.32 0.097 146.2);
}

.element {
  color: var(--realm-of-the-underworld);
  background-color: hsl(134 100% 12%);
  border-color: oklch(0.32 0.097 146.2);
}

Tailwind CSS v4

@theme {
  --color-realm-of-the-underworld: #003f0f;
  --color-realm-of-the-underworld-50: #e3fde6;
  --color-realm-of-the-underworld-100: #d3f1d6;
  --color-realm-of-the-underworld-200: #b9e0bd;
  --color-realm-of-the-underworld-300: #96c69c;
  --color-realm-of-the-underworld-400: #78ae7c;
  --color-realm-of-the-underworld-500: #59975e;
  --color-realm-of-the-underworld-600: #4c8050;
  --color-realm-of-the-underworld-700: #3c6740;
  --color-realm-of-the-underworld-800: #2c4b2c;
  --color-realm-of-the-underworld-900: #1e341e;
  --color-realm-of-the-underworld-950: #0e200e;
}

SCSS

$realm-of-the-underworld: #003f0f;
$realm-of-the-underworld-rgb: 0, 63, 15;
$realm-of-the-underworld-light: mix(#fff, $realm-of-the-underworld, 20%);
$realm-of-the-underworld-dark: mix(#000, $realm-of-the-underworld, 20%);

.element {
  color: $realm-of-the-underworld;
  box-shadow: 0 0 0 2px rgba($realm-of-the-underworld, 0.35);
}