#052F1F

CSS

:root {
  --pitch-black-forests: #052f1f;
  --pitch-black-forests-rgb: 5 47 31;
  --pitch-black-forests-oklch: oklch(0.272 0.054 162.8);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(157 81% 10%);
  border-color: oklch(0.272 0.054 162.8);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #052f1f;
  --color-pitch-black-forests-50: #e8faf1;
  --color-pitch-black-forests-100: #d8eee3;
  --color-pitch-black-forests-200: #c0dcce;
  --color-pitch-black-forests-300: #9ec1b0;
  --color-pitch-black-forests-400: #82a995;
  --color-pitch-black-forests-500: #65927c;
  --color-pitch-black-forests-600: #567b69;
  --color-pitch-black-forests-700: #446354;
  --color-pitch-black-forests-800: #32483c;
  --color-pitch-black-forests-900: #223229;
  --color-pitch-black-forests-950: #111e17;
}

SCSS

$pitch-black-forests: #052f1f;
$pitch-black-forests-rgb: 5, 47, 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);
}