#180819

CSS

:root {
  --shot-in-the-dark: #180819;
  --shot-in-the-dark-rgb: 24 8 25;
  --shot-in-the-dark-oklch: oklch(0.169 0.042 325.1);
}

.element {
  color: var(--shot-in-the-dark);
  background-color: hsl(296 52% 6%);
  border-color: oklch(0.169 0.042 325.1);
}

Tailwind CSS v4

@theme {
  --color-shot-in-the-dark: #180819;
  --color-shot-in-the-dark-50: #fcf1fb;
  --color-shot-in-the-dark-100: #f0e3ef;
  --color-shot-in-the-dark-200: #decede;
  --color-shot-in-the-dark-300: #c3b0c3;
  --color-shot-in-the-dark-400: #ac96ac;
  --color-shot-in-the-dark-500: #957d96;
  --color-shot-in-the-dark-600: #7e6a7f;
  --color-shot-in-the-dark-700: #655565;
  --color-shot-in-the-dark-800: #4a3e4b;
  --color-shot-in-the-dark-900: #332a34;
  --color-shot-in-the-dark-950: #1f181f;
}

SCSS

$shot-in-the-dark: #180819;
$shot-in-the-dark-rgb: 24, 8, 25;
$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);
}