#022D18

CSS

:root {
  --pitch-black-forests: #022d18;
  --pitch-black-forests-rgb: 2 45 24;
  --pitch-black-forests-oklch: oklch(0.262 0.061 156.7);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(151 91% 9%);
  border-color: oklch(0.262 0.061 156.7);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #022d18;
  --color-pitch-black-forests-50: #e7fbef;
  --color-pitch-black-forests-100: #d8eee0;
  --color-pitch-black-forests-200: #bfddcb;
  --color-pitch-black-forests-300: #9ec1ac;
  --color-pitch-black-forests-400: #81aa90;
  --color-pitch-black-forests-500: #649376;
  --color-pitch-black-forests-600: #557c64;
  --color-pitch-black-forests-700: #446350;
  --color-pitch-black-forests-800: #314939;
  --color-pitch-black-forests-900: #223227;
  --color-pitch-black-forests-950: #111e15;
}

SCSS

$pitch-black-forests: #022d18;
$pitch-black-forests-rgb: 2, 45, 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);
}