#380015

CSS

:root {
  --what-we-do-in-the-shadows: #380015;
  --what-we-do-in-the-shadows-rgb: 56 0 21;
  --what-we-do-in-the-shadows-oklch: oklch(0.219 0.088 4.8);
}

.element {
  color: var(--what-we-do-in-the-shadows);
  background-color: hsl(338 100% 11%);
  border-color: oklch(0.219 0.088 4.8);
}

Tailwind CSS v4

@theme {
  --color-what-we-do-in-the-shadows: #380015;
  --color-what-we-do-in-the-shadows-50: #ffebf1;
  --color-what-we-do-in-the-shadows-100: #ffdce3;
  --color-what-we-do-in-the-shadows-200: #f7c5ce;
  --color-what-we-do-in-the-shadows-300: #e0a5b0;
  --color-what-we-do-in-the-shadows-400: #cb8998;
  --color-what-we-do-in-the-shadows-500: #b76d7e;
  --color-what-we-do-in-the-shadows-600: #9b5c6b;
  --color-what-we-do-in-the-shadows-700: #7c4a56;
  --color-what-we-do-in-the-shadows-800: #5c353f;
  --color-what-we-do-in-the-shadows-900: #40242c;
  --color-what-we-do-in-the-shadows-950: #291319;
}

SCSS

$what-we-do-in-the-shadows: #380015;
$what-we-do-in-the-shadows-rgb: 56, 0, 21;
$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);
}