#003F2F

CSS

:root {
  --pitch-black-forests: #003f2f;
  --pitch-black-forests-rgb: 0 63 47;
  --pitch-black-forests-oklch: oklch(0.327 0.065 169.4);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(165 100% 12%);
  border-color: oklch(0.327 0.065 169.4);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #003f2f;
  --color-pitch-black-forests-50: #e4fcf3;
  --color-pitch-black-forests-100: #d3efe5;
  --color-pitch-black-forests-200: #b9ded1;
  --color-pitch-black-forests-300: #96c3b3;
  --color-pitch-black-forests-400: #78ab98;
  --color-pitch-black-forests-500: #58947f;
  --color-pitch-black-forests-600: #4b7d6c;
  --color-pitch-black-forests-700: #3c6456;
  --color-pitch-black-forests-800: #2b4a3e;
  --color-pitch-black-forests-900: #1d332a;
  --color-pitch-black-forests-950: #0d1f18;
}

SCSS

$pitch-black-forests: #003f2f;
$pitch-black-forests-rgb: 0, 63, 47;
$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);
}