#140912

CSS

:root {
  --noir-fiction: #140912;
  --noir-fiction-rgb: 20 9 18;
  --noir-fiction-oklch: oklch(0.16 0.026 333.5);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(311 38% 6%);
  border-color: oklch(0.16 0.026 333.5);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #140912;
  --color-noir-fiction-50: #faf2f8;
  --color-noir-fiction-100: #eee5eb;
  --color-noir-fiction-200: #dcd0d9;
  --color-noir-fiction-300: #c0b3bd;
  --color-noir-fiction-400: #a899a5;
  --color-noir-fiction-500: #91808d;
  --color-noir-fiction-600: #7b6c78;
  --color-noir-fiction-700: #625760;
  --color-noir-fiction-800: #483f46;
  --color-noir-fiction-900: #322c31;
  --color-noir-fiction-950: #1e191d;
}

SCSS

$noir-fiction: #140912;
$noir-fiction-rgb: 20, 9, 18;
$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);
}