#003B24

CSS

:root {
  --pitch-black-forests: #003b24;
  --pitch-black-forests-rgb: 0 59 36;
  --pitch-black-forests-oklch: oklch(0.311 0.07 160.2);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(157 100% 12%);
  border-color: oklch(0.311 0.07 160.2);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #003b24;
  --color-pitch-black-forests-50: #e4fcef;
  --color-pitch-black-forests-100: #d4f0e1;
  --color-pitch-black-forests-200: #bbdecb;
  --color-pitch-black-forests-300: #98c3ad;
  --color-pitch-black-forests-400: #7aac90;
  --color-pitch-black-forests-500: #5b9576;
  --color-pitch-black-forests-600: #4d7e64;
  --color-pitch-black-forests-700: #3e6550;
  --color-pitch-black-forests-800: #2d4a39;
  --color-pitch-black-forests-900: #1e3327;
  --color-pitch-black-forests-950: #0e1f15;
}

SCSS

$pitch-black-forests: #003b24;
$pitch-black-forests-rgb: 0, 59, 36;
$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);
}