#003226

CSS

:root {
  --pitch-black-forests: #003226;
  --pitch-black-forests-rgb: 0 50 38;
  --pitch-black-forests-oklch: oklch(0.282 0.055 171.5);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(166 100% 10%);
  border-color: oklch(0.282 0.055 171.5);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #003226;
  --color-pitch-black-forests-50: #e6fbf4;
  --color-pitch-black-forests-100: #d6eee6;
  --color-pitch-black-forests-200: #bddcd2;
  --color-pitch-black-forests-300: #9bc1b5;
  --color-pitch-black-forests-400: #7ea99a;
  --color-pitch-black-forests-500: #5f9282;
  --color-pitch-black-forests-600: #517c6e;
  --color-pitch-black-forests-700: #416358;
  --color-pitch-black-forests-800: #2f493f;
  --color-pitch-black-forests-900: #20322c;
  --color-pitch-black-forests-950: #0f1e19;
}

SCSS

$pitch-black-forests: #003226;
$pitch-black-forests-rgb: 0, 50, 38;
$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);
}