#002A21

CSS

:root {
  --pitch-black-forests: #002a21;
  --pitch-black-forests-rgb: 0 42 33;
  --pitch-black-forests-oklch: oklch(0.254 0.048 174.4);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(167 100% 8%);
  border-color: oklch(0.254 0.048 174.4);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #002a21;
  --color-pitch-black-forests-50: #e8faf5;
  --color-pitch-black-forests-100: #d8ede7;
  --color-pitch-black-forests-200: #c0dbd3;
  --color-pitch-black-forests-300: #9ec0b6;
  --color-pitch-black-forests-400: #81a89c;
  --color-pitch-black-forests-500: #649184;
  --color-pitch-black-forests-600: #557b70;
  --color-pitch-black-forests-700: #446259;
  --color-pitch-black-forests-800: #314841;
  --color-pitch-black-forests-900: #21322c;
  --color-pitch-black-forests-950: #101e1a;
}

SCSS

$pitch-black-forests: #002a21;
$pitch-black-forests-rgb: 0, 42, 33;
$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);
}