#0E040C

CSS

:root {
  --noir-fiction: #0e040c;
  --noir-fiction-rgb: 14 4 12;
  --noir-fiction-oklch: oklch(0.131 0.028 333.8);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(312 56% 4%);
  border-color: oklch(0.131 0.028 333.8);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #0e040c;
  --color-noir-fiction-50: #fbf2f8;
  --color-noir-fiction-100: #eee4eb;
  --color-noir-fiction-200: #ddd0d9;
  --color-noir-fiction-300: #c1b2bd;
  --color-noir-fiction-400: #a998a5;
  --color-noir-fiction-500: #927f8e;
  --color-noir-fiction-600: #7c6c78;
  --color-noir-fiction-700: #635660;
  --color-noir-fiction-800: #483f47;
  --color-noir-fiction-900: #322b31;
  --color-noir-fiction-950: #1e191d;
}

SCSS

$noir-fiction: #0e040c;
$noir-fiction-rgb: 14, 4, 12;
$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);
}