#0E050F

CSS

:root {
  --noir-fiction: #0e050f;
  --noir-fiction-rgb: 14 5 15;
  --noir-fiction-oklch: oklch(0.137 0.029 323.7);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(294 50% 4%);
  border-color: oklch(0.137 0.029 323.7);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #0e050f;
  --color-noir-fiction-50: #faf2fa;
  --color-noir-fiction-100: #ede5ed;
  --color-noir-fiction-200: #dbd0db;
  --color-noir-fiction-300: #bfb3bf;
  --color-noir-fiction-400: #a799a8;
  --color-noir-fiction-500: #908091;
  --color-noir-fiction-600: #7a6c7b;
  --color-noir-fiction-700: #615762;
  --color-noir-fiction-800: #473f48;
  --color-noir-fiction-900: #312c32;
  --color-noir-fiction-950: #1d191e;
}

SCSS

$noir-fiction: #0e050f;
$noir-fiction-rgb: 14, 5, 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);
}