#00392E

CSS

:root {
  --pitch-black-forests: #00392e;
  --pitch-black-forests-rgb: 0 57 46;
  --pitch-black-forests-oklch: oklch(0.308 0.058 175);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(168 100% 11%);
  border-color: oklch(0.308 0.058 175);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #00392e;
  --color-pitch-black-forests-50: #e5fbf5;
  --color-pitch-black-forests-100: #d5efe7;
  --color-pitch-black-forests-200: #bbddd4;
  --color-pitch-black-forests-300: #99c2b7;
  --color-pitch-black-forests-400: #7aaa9c;
  --color-pitch-black-forests-500: #5b9384;
  --color-pitch-black-forests-600: #4e7c70;
  --color-pitch-black-forests-700: #3e6459;
  --color-pitch-black-forests-800: #2d4940;
  --color-pitch-black-forests-900: #1e332c;
  --color-pitch-black-forests-950: #0e1e19;
}

SCSS

$pitch-black-forests: #00392e;
$pitch-black-forests-rgb: 0, 57, 46;
$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);
}