#10040D

CSS

:root {
  --noir-fiction: #10040d;
  --noir-fiction-rgb: 16 4 13;
  --noir-fiction-oklch: oklch(0.135 0.032 336.2);
}

.element {
  color: var(--noir-fiction);
  background-color: hsl(315 60% 4%);
  border-color: oklch(0.135 0.032 336.2);
}

Tailwind CSS v4

@theme {
  --color-noir-fiction: #10040d;
  --color-noir-fiction-50: #fcf2f8;
  --color-noir-fiction-100: #efe4ec;
  --color-noir-fiction-200: #decfd9;
  --color-noir-fiction-300: #c3b1bd;
  --color-noir-fiction-400: #ab98a6;
  --color-noir-fiction-500: #947e8e;
  --color-noir-fiction-600: #7e6b78;
  --color-noir-fiction-700: #655660;
  --color-noir-fiction-800: #4a3e47;
  --color-noir-fiction-900: #332b31;
  --color-noir-fiction-950: #1f181d;
}

SCSS

$noir-fiction: #10040d;
$noir-fiction-rgb: 16, 4, 13;
$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);
}