#002F21

CSS

:root {
  --pitch-black-forests: #002f21;
  --pitch-black-forests-rgb: 0 47 33;
  --pitch-black-forests-oklch: oklch(0.271 0.055 167.3);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(162 100% 9%);
  border-color: oklch(0.271 0.055 167.3);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #002f21;
  --color-pitch-black-forests-50: #e7fbf2;
  --color-pitch-black-forests-100: #d7eee5;
  --color-pitch-black-forests-200: #bedcd0;
  --color-pitch-black-forests-300: #9cc1b3;
  --color-pitch-black-forests-400: #7fa998;
  --color-pitch-black-forests-500: #61927f;
  --color-pitch-black-forests-600: #537c6b;
  --color-pitch-black-forests-700: #426356;
  --color-pitch-black-forests-800: #30493e;
  --color-pitch-black-forests-900: #20322a;
  --color-pitch-black-forests-950: #101e18;
}

SCSS

$pitch-black-forests: #002f21;
$pitch-black-forests-rgb: 0, 47, 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);
}