#130B15

CSS

:root {
  --noir-fiction: #130b15;
  --noir-fiction-rgb: 19 11 21;
  --noir-fiction-oklch: oklch(0.166 0.024 319.5);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(288 31% 6%);
  border-color: oklch(0.166 0.024 319.5);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #130b15;
  --color-noir-fiction-50: #f8f3f9;
  --color-noir-fiction-100: #ece5ed;
  --color-noir-fiction-200: #d9d1da;
  --color-noir-fiction-300: #bdb4bf;
  --color-noir-fiction-400: #a59aa8;
  --color-noir-fiction-500: #8d8190;
  --color-noir-fiction-600: #786d7a;
  --color-noir-fiction-700: #605862;
  --color-noir-fiction-800: #464048;
  --color-noir-fiction-900: #302c32;
  --color-noir-fiction-950: #1d191e;
}

SCSS

$noir-fiction: #130b15;
$noir-fiction-rgb: 19, 11, 21;
$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);
}