#150D14

CSS

:root {
  --noir-fiction: #150d14;
  --noir-fiction-rgb: 21 13 20;
  --noir-fiction-oklch: oklch(0.173 0.019 330.7);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(308 24% 7%);
  border-color: oklch(0.173 0.019 330.7);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #150d14;
  --color-noir-fiction-50: #f9f3f7;
  --color-noir-fiction-100: #ece6eb;
  --color-noir-fiction-200: #d9d1d8;
  --color-noir-fiction-300: #beb4bc;
  --color-noir-fiction-400: #a59aa4;
  --color-noir-fiction-500: #8e828c;
  --color-noir-fiction-600: #786e77;
  --color-noir-fiction-700: #60585f;
  --color-noir-fiction-800: #464046;
  --color-noir-fiction-900: #312c30;
  --color-noir-fiction-950: #1d191c;
}

SCSS

$noir-fiction: #150d14;
$noir-fiction-rgb: 21, 13, 20;
$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);
}