#110713

CSS

:root {
  --noir-fiction: #110713;
  --noir-fiction-rgb: 17 7 19;
  --noir-fiction-oklch: oklch(0.151 0.03 320.9);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(290 46% 5%);
  border-color: oklch(0.151 0.03 320.9);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #110713;
  --color-noir-fiction-50: #faf2fa;
  --color-noir-fiction-100: #ede5ee;
  --color-noir-fiction-200: #dbd0dc;
  --color-noir-fiction-300: #bfb2c1;
  --color-noir-fiction-400: #a799aa;
  --color-noir-fiction-500: #908093;
  --color-noir-fiction-600: #7a6c7c;
  --color-noir-fiction-700: #615763;
  --color-noir-fiction-800: #473f49;
  --color-noir-fiction-900: #312b33;
  --color-noir-fiction-950: #1d191e;
}

SCSS

$noir-fiction: #110713;
$noir-fiction-rgb: 17, 7, 19;
$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);
}