#10030A

CSS

:root {
  --noir-fiction: #10030a;
  --noir-fiction-rgb: 16 3 10;
  --noir-fiction-oklch: oklch(0.13 0.033 345);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(328 68% 4%);
  border-color: oklch(0.13 0.033 345);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #10030a;
  --color-noir-fiction-50: #fdf1f7;
  --color-noir-fiction-100: #f1e4ea;
  --color-noir-fiction-200: #e0cfd7;
  --color-noir-fiction-300: #c5b1bb;
  --color-noir-fiction-400: #ae97a3;
  --color-noir-fiction-500: #977e8b;
  --color-noir-fiction-600: #806a76;
  --color-noir-fiction-700: #66555e;
  --color-noir-fiction-800: #4b3e45;
  --color-noir-fiction-900: #342b30;
  --color-noir-fiction-950: #1f181c;
}

SCSS

$noir-fiction: #10030a;
$noir-fiction-rgb: 16, 3, 10;
$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);
}