#00291F

CSS

:root {
  --pitch-black-forests: #00291f;
  --pitch-black-forests-rgb: 0 41 31;
  --pitch-black-forests-oklch: oklch(0.25 0.048 172.1);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(165 100% 8%);
  border-color: oklch(0.25 0.048 172.1);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #00291f;
  --color-pitch-black-forests-50: #e8faf4;
  --color-pitch-black-forests-100: #d8ede7;
  --color-pitch-black-forests-200: #c0dbd3;
  --color-pitch-black-forests-300: #9fc0b5;
  --color-pitch-black-forests-400: #82a89b;
  --color-pitch-black-forests-500: #659182;
  --color-pitch-black-forests-600: #567b6e;
  --color-pitch-black-forests-700: #446258;
  --color-pitch-black-forests-800: #314840;
  --color-pitch-black-forests-900: #22322c;
  --color-pitch-black-forests-950: #111e19;
}

SCSS

$pitch-black-forests: #00291f;
$pitch-black-forests-rgb: 0, 41, 31;
$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);
}