#153122

CSS

:root {
  --pitch-black-forests: #153122;
  --pitch-black-forests-rgb: 21 49 34;
  --pitch-black-forests-oklch: oklch(0.286 0.044 158.4);
}

.element {
  color: var(--pitch-black-forests);
  background-color: hsl(148 40% 14%);
  border-color: oklch(0.286 0.044 158.4);
}

Tailwind CSS v4

@theme {
  --color-pitch-black-forests: #153122;
  --color-pitch-black-forests-50: #ebf9f1;
  --color-pitch-black-forests-100: #dcede3;
  --color-pitch-black-forests-200: #c5dace;
  --color-pitch-black-forests-300: #a5bfb0;
  --color-pitch-black-forests-400: #89a795;
  --color-pitch-black-forests-500: #6e8f7b;
  --color-pitch-black-forests-600: #5d7968;
  --color-pitch-black-forests-700: #4a6153;
  --color-pitch-black-forests-800: #36473c;
  --color-pitch-black-forests-900: #253129;
  --color-pitch-black-forests-950: #131d17;
}

SCSS

$pitch-black-forests: #153122;
$pitch-black-forests-rgb: 21, 49, 34;
$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);
}