#221222

CSS

:root {
  --shot-in-the-dark: #221222;
  --shot-in-the-dark-rgb: 34 18 34;
  --shot-in-the-dark-oklch: oklch(0.212 0.039 326.8);
}

.element {
  color: var(--shot-in-the-dark);
  background-color: hsl(300 31% 10%);
  border-color: oklch(0.212 0.039 326.8);
}

Tailwind CSS v4

@theme {
  --color-shot-in-the-dark: #221222;
  --color-shot-in-the-dark-50: #fcf1fb;
  --color-shot-in-the-dark-100: #f0e3ee;
  --color-shot-in-the-dark-200: #decfdd;
  --color-shot-in-the-dark-300: #c3b1c1;
  --color-shot-in-the-dark-400: #ab97ab;
  --color-shot-in-the-dark-500: #947e94;
  --color-shot-in-the-dark-600: #7e6a7d;
  --color-shot-in-the-dark-700: #645564;
  --color-shot-in-the-dark-800: #493e4a;
  --color-shot-in-the-dark-900: #332b33;
  --color-shot-in-the-dark-950: #1f181f;
}

SCSS

$shot-in-the-dark: #221222;
$shot-in-the-dark-rgb: 34, 18, 34;
$shot-in-the-dark-light: mix(#fff, $shot-in-the-dark, 20%);
$shot-in-the-dark-dark: mix(#000, $shot-in-the-dark, 20%);

.element {
  color: $shot-in-the-dark;
  box-shadow: 0 0 0 2px rgba($shot-in-the-dark, 0.35);
}