#3B061E

CSS

:root {
  --what-we-do-in-the-shadows: #3b061e;
  --what-we-do-in-the-shadows-rgb: 59 6 30;
  --what-we-do-in-the-shadows-oklch: oklch(0.237 0.084 358.5);
}

.element {
  color: var(--what-we-do-in-the-shadows);
  background-color: hsl(333 82% 13%);
  border-color: oklch(0.237 0.084 358.5);
}

Tailwind CSS v4

@theme {
  --color-what-we-do-in-the-shadows: #3b061e;
  --color-what-we-do-in-the-shadows-50: #ffecf4;
  --color-what-we-do-in-the-shadows-100: #ffdde6;
  --color-what-we-do-in-the-shadows-200: #f4c6d2;
  --color-what-we-do-in-the-shadows-300: #dda6b5;
  --color-what-we-do-in-the-shadows-400: #c88a9e;
  --color-what-we-do-in-the-shadows-500: #b36e85;
  --color-what-we-do-in-the-shadows-600: #985d71;
  --color-what-we-do-in-the-shadows-700: #7a4a5a;
  --color-what-we-do-in-the-shadows-800: #5a3643;
  --color-what-we-do-in-the-shadows-900: #3f252e;
  --color-what-we-do-in-the-shadows-950: #28131b;
}

SCSS

$what-we-do-in-the-shadows: #3b061e;
$what-we-do-in-the-shadows-rgb: 59, 6, 30;
$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);
}