#1B0F16

CSS

:root {
  --noir-fiction: #1b0f16;
  --noir-fiction-rgb: 27 15 22;
  --noir-fiction-oklch: oklch(0.188 0.024 343.8);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(325 29% 8%);
  border-color: oklch(0.188 0.024 343.8);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #1b0f16;
  --color-noir-fiction-50: #fbf2f6;
  --color-noir-fiction-100: #eee5e9;
  --color-noir-fiction-200: #dcd0d6;
  --color-noir-fiction-300: #c1b3ba;
  --color-noir-fiction-400: #a999a2;
  --color-noir-fiction-500: #92808a;
  --color-noir-fiction-600: #7c6c75;
  --color-noir-fiction-700: #63575d;
  --color-noir-fiction-800: #493f45;
  --color-noir-fiction-900: #322c2f;
  --color-noir-fiction-950: #1e191c;
}

SCSS

$noir-fiction: #1b0f16;
$noir-fiction-rgb: 27, 15, 22;
$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);
}