#002C1B

CSS

:root {
  --pitch-black-forests: #002c1b;
  --pitch-black-forests-rgb: 0 44 27;
  --pitch-black-forests-oklch: oklch(0.259 0.057 161.9);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(157 100% 9%);
  border-color: oklch(0.259 0.057 161.9);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #002c1b;
  --color-pitch-black-forests-50: #e7fbf1;
  --color-pitch-black-forests-100: #d8eee3;
  --color-pitch-black-forests-200: #bfdcce;
  --color-pitch-black-forests-300: #9ec1b0;
  --color-pitch-black-forests-400: #81a994;
  --color-pitch-black-forests-500: #63927b;
  --color-pitch-black-forests-600: #547c68;
  --color-pitch-black-forests-700: #436353;
  --color-pitch-black-forests-800: #31493c;
  --color-pitch-black-forests-900: #213229;
  --color-pitch-black-forests-950: #101e17;
}

SCSS

$pitch-black-forests: #002c1b;
$pitch-black-forests-rgb: 0, 44, 27;
$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);
}