#023128

CSS

:root {
  --pitch-black-forests: #023128;
  --pitch-black-forests-rgb: 2 49 40;
  --pitch-black-forests-oklch: oklch(0.281 0.051 176);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(169 92% 10%);
  border-color: oklch(0.281 0.051 176);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #023128;
  --color-pitch-black-forests-50: #e7faf5;
  --color-pitch-black-forests-100: #d7eee8;
  --color-pitch-black-forests-200: #bedcd4;
  --color-pitch-black-forests-300: #9cc0b7;
  --color-pitch-black-forests-400: #7fa99d;
  --color-pitch-black-forests-500: #619285;
  --color-pitch-black-forests-600: #537b70;
  --color-pitch-black-forests-700: #42635a;
  --color-pitch-black-forests-800: #304841;
  --color-pitch-black-forests-900: #20322d;
  --color-pitch-black-forests-950: #101e1a;
}

SCSS

$pitch-black-forests: #023128;
$pitch-black-forests-rgb: 2, 49, 40;
$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);
}