#140913

CSS

:root {
  --noir-fiction: #140913;
  --noir-fiction-rgb: 20 9 19;
  --noir-fiction-oklch: oklch(0.161 0.027 330);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(305 38% 6%);
  border-color: oklch(0.161 0.027 330);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #140913;
  --color-noir-fiction-50: #faf2f9;
  --color-noir-fiction-100: #eee5ec;
  --color-noir-fiction-200: #dcd0d9;
  --color-noir-fiction-300: #c0b3be;
  --color-noir-fiction-400: #a899a6;
  --color-noir-fiction-500: #91808f;
  --color-noir-fiction-600: #7b6c79;
  --color-noir-fiction-700: #625761;
  --color-noir-fiction-800: #483f47;
  --color-noir-fiction-900: #322b31;
  --color-noir-fiction-950: #1e191d;
}

SCSS

$noir-fiction: #140913;
$noir-fiction-rgb: 20, 9, 19;
$noir-fiction-light: mix(#fff, $noir-fiction, 20%);
$noir-fiction-dark: mix(#000, $noir-fiction, 20%);

.element {
  color: $noir-fiction;
  box-shadow: 0 0 0 2px rgba($noir-fiction, 0.35);
}