#191221

CSS

:root {
  --shot-in-the-dark: #191221;
  --shot-in-the-dark-rgb: 25 18 33;
  --shot-in-the-dark-oklch: oklch(0.199 0.031 305.2);
}

.element {
  color: var(--shot-in-the-dark);
  background-color: hsl(268 29% 10%);
  border-color: oklch(0.199 0.031 305.2);
}

Tailwind CSS v4

@theme {
  --color-shot-in-the-dark: #191221;
  --color-shot-in-the-dark-50: #f7f3fc;
  --color-shot-in-the-dark-100: #eae5f0;
  --color-shot-in-the-dark-200: #d8d1df;
  --color-shot-in-the-dark-300: #bbb3c4;
  --color-shot-in-the-dark-400: #a39aae;
  --color-shot-in-the-dark-500: #8b8197;
  --color-shot-in-the-dark-600: #756d80;
  --color-shot-in-the-dark-700: #5e5766;
  --color-shot-in-the-dark-800: #44404b;
  --color-shot-in-the-dark-900: #2f2c34;
  --color-shot-in-the-dark-950: #1c1920;
}

SCSS

$shot-in-the-dark: #191221;
$shot-in-the-dark-rgb: 25, 18, 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);
}