#1C1421

CSS

:root {
  --shot-in-the-dark: #1c1421;
  --shot-in-the-dark-rgb: 28 20 33;
  --shot-in-the-dark-oklch: oklch(0.208 0.028 312);
}

.element {
  color: var(--shot-in-the-dark);
  background-color: hsl(277 25% 10%);
  border-color: oklch(0.208 0.028 312);
}

Tailwind CSS v4

@theme {
  --color-shot-in-the-dark: #1c1421;
  --color-shot-in-the-dark-50: #f8f3fb;
  --color-shot-in-the-dark-100: #ebe5ef;
  --color-shot-in-the-dark-200: #d9d1dd;
  --color-shot-in-the-dark-300: #bdb3c2;
  --color-shot-in-the-dark-400: #a49aab;
  --color-shot-in-the-dark-500: #8c8194;
  --color-shot-in-the-dark-600: #776d7d;
  --color-shot-in-the-dark-700: #5f5764;
  --color-shot-in-the-dark-800: #45404a;
  --color-shot-in-the-dark-900: #302c33;
  --color-shot-in-the-dark-950: #1c191f;
}

SCSS

$shot-in-the-dark: #1c1421;
$shot-in-the-dark-rgb: 28, 20, 33;
$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);
}