#380013

CSS

:root {
  --what-we-do-in-the-shadows: #380013;
  --what-we-do-in-the-shadows-rgb: 56 0 19;
  --what-we-do-in-the-shadows-oklch: oklch(0.218 0.088 7.2);
}

.element {
  color: var(--what-we-do-in-the-shadows);
  background-color: hsl(340 100% 11%);
  border-color: oklch(0.218 0.088 7.2);
}

Tailwind CSS v4

@theme {
  --color-what-we-do-in-the-shadows: #380013;
  --color-what-we-do-in-the-shadows-50: #ffebf0;
  --color-what-we-do-in-the-shadows-100: #ffdce2;
  --color-what-we-do-in-the-shadows-200: #f7c5cc;
  --color-what-we-do-in-the-shadows-300: #e0a5ae;
  --color-what-we-do-in-the-shadows-400: #cc8995;
  --color-what-we-do-in-the-shadows-500: #b76d7c;
  --color-what-we-do-in-the-shadows-600: #9b5c69;
  --color-what-we-do-in-the-shadows-700: #7c4a54;
  --color-what-we-do-in-the-shadows-800: #5c353e;
  --color-what-we-do-in-the-shadows-900: #40242b;
  --color-what-we-do-in-the-shadows-950: #291318;
}

SCSS

$what-we-do-in-the-shadows: #380013;
$what-we-do-in-the-shadows-rgb: 56, 0, 19;
$what-we-do-in-the-shadows-light: mix(#fff, $what-we-do-in-the-shadows, 20%);
$what-we-do-in-the-shadows-dark: mix(#000, $what-we-do-in-the-shadows, 20%);

.element {
  color: $what-we-do-in-the-shadows;
  box-shadow: 0 0 0 2px rgba($what-we-do-in-the-shadows, 0.35);
}