#002418

CSS

:root {
  --pitch-black-forests: #002418;
  --pitch-black-forests-rgb: 0 36 24;
  --pitch-black-forests-oklch: oklch(0.231 0.048 166.4);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(160 100% 7%);
  border-color: oklch(0.231 0.048 166.4);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #002418;
  --color-pitch-black-forests-50: #e9faf3;
  --color-pitch-black-forests-100: #d9ede5;
  --color-pitch-black-forests-200: #c2dbd0;
  --color-pitch-black-forests-300: #a1c0b3;
  --color-pitch-black-forests-400: #84a898;
  --color-pitch-black-forests-500: #68917f;
  --color-pitch-black-forests-600: #587a6c;
  --color-pitch-black-forests-700: #466256;
  --color-pitch-black-forests-800: #33483e;
  --color-pitch-black-forests-900: #23322b;
  --color-pitch-black-forests-950: #121e18;
}

SCSS

$pitch-black-forests: #002418;
$pitch-black-forests-rgb: 0, 36, 24;
$pitch-black-forests-light: mix(#fff, $pitch-black-forests, 20%);
$pitch-black-forests-dark: mix(#000, $pitch-black-forests, 20%);

.element {
  color: $pitch-black-forests;
  box-shadow: 0 0 0 2px rgba($pitch-black-forests, 0.35);
}