#11030F

CSS

:root {
  --noir-fiction: #11030f;
  --noir-fiction-rgb: 17 3 15;
  --noir-fiction-oklch: oklch(0.135 0.04 332.5);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(309 70% 4%);
  border-color: oklch(0.135 0.04 332.5);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #11030f;
  --color-noir-fiction-50: #fdf1fa;
  --color-noir-fiction-100: #f1e3ed;
  --color-noir-fiction-200: #e0cedb;
  --color-noir-fiction-300: #c5b0c0;
  --color-noir-fiction-400: #ad96a9;
  --color-noir-fiction-500: #977d92;
  --color-noir-fiction-600: #7f6a7b;
  --color-noir-fiction-700: #665463;
  --color-noir-fiction-800: #4b3e49;
  --color-noir-fiction-900: #342a33;
  --color-noir-fiction-950: #1f181e;
}

SCSS

$noir-fiction: #11030f;
$noir-fiction-rgb: 17, 3, 15;
$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);
}