#003A29

CSS

:root {
  --pitch-black-forests: #003a29;
  --pitch-black-forests-rgb: 0 58 41;
  --pitch-black-forests-oklch: oklch(0.309 0.064 166.7);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(162 100% 11%);
  border-color: oklch(0.309 0.064 166.7);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #003a29;
  --color-pitch-black-forests-50: #e5fbf2;
  --color-pitch-black-forests-100: #d4efe4;
  --color-pitch-black-forests-200: #bbddcf;
  --color-pitch-black-forests-300: #98c2b2;
  --color-pitch-black-forests-400: #7aab96;
  --color-pitch-black-forests-500: #5b947d;
  --color-pitch-black-forests-600: #4e7d6a;
  --color-pitch-black-forests-700: #3e6455;
  --color-pitch-black-forests-800: #2d493d;
  --color-pitch-black-forests-900: #1e332a;
  --color-pitch-black-forests-950: #0e1f17;
}

SCSS

$pitch-black-forests: #003a29;
$pitch-black-forests-rgb: 0, 58, 41;
$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);
}