#110912

CSS

:root {
  --noir-fiction: #110912;
  --noir-fiction-rgb: 17 9 18;
  --noir-fiction-oklch: oklch(0.156 0.023 322.8);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(293 33% 5%);
  border-color: oklch(0.156 0.023 322.8);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #110912;
  --color-noir-fiction-50: #f9f3f9;
  --color-noir-fiction-100: #ece5ec;
  --color-noir-fiction-200: #d9d1da;
  --color-noir-fiction-300: #beb4be;
  --color-noir-fiction-400: #a59aa6;
  --color-noir-fiction-500: #8e818f;
  --color-noir-fiction-600: #786e79;
  --color-noir-fiction-700: #605861;
  --color-noir-fiction-800: #464047;
  --color-noir-fiction-900: #302c31;
  --color-noir-fiction-950: #1d191d;
}

SCSS

$noir-fiction: #110912;
$noir-fiction-rgb: 17, 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);
}