#004032

CSS

:root {
  --pitch-black-forests: #004032;
  --pitch-black-forests-rgb: 0 64 50;
  --pitch-black-forests-oklch: oklch(0.331 0.064 172.3);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(167 100% 13%);
  border-color: oklch(0.331 0.064 172.3);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #004032;
  --color-pitch-black-forests-50: #e3fcf4;
  --color-pitch-black-forests-100: #d3efe6;
  --color-pitch-black-forests-200: #b9ded2;
  --color-pitch-black-forests-300: #96c3b5;
  --color-pitch-black-forests-400: #77ab9a;
  --color-pitch-black-forests-500: #579482;
  --color-pitch-black-forests-600: #4a7d6e;
  --color-pitch-black-forests-700: #3b6458;
  --color-pitch-black-forests-800: #2b4a3f;
  --color-pitch-black-forests-900: #1d332b;
  --color-pitch-black-forests-950: #0c1f19;
}

SCSS

$pitch-black-forests: #004032;
$pitch-black-forests-rgb: 0, 64, 50;
$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);
}