#120A10

CSS

:root {
  --noir-fiction: #120a10;
  --noir-fiction-rgb: 18 10 16;
  --noir-fiction-oklch: oklch(0.159 0.018 335.7);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(315 29% 5%);
  border-color: oklch(0.159 0.018 335.7);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #120a10;
  --color-noir-fiction-50: #f9f3f7;
  --color-noir-fiction-100: #ece6ea;
  --color-noir-fiction-200: #dad1d7;
  --color-noir-fiction-300: #beb4bb;
  --color-noir-fiction-400: #a69ba3;
  --color-noir-fiction-500: #8e828b;
  --color-noir-fiction-600: #786e75;
  --color-noir-fiction-700: #60585e;
  --color-noir-fiction-800: #464045;
  --color-noir-fiction-900: #312c30;
  --color-noir-fiction-950: #1d191c;
}

SCSS

$noir-fiction: #120a10;
$noir-fiction-rgb: 18, 10, 16;
$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);
}