#370119

CSS

:root {
  --what-we-do-in-the-shadows: #370119;
  --what-we-do-in-the-shadows-rgb: 55 1 25;
  --what-we-do-in-the-shadows-oklch: oklch(0.22 0.087 359.8);
}

.element {
  color: var(--what-we-do-in-the-shadows);
  background-color: hsl(333 96% 11%);
  border-color: oklch(0.22 0.087 359.8);
}

Tailwind CSS v4

@theme {
  --color-what-we-do-in-the-shadows: #370119;
  --color-what-we-do-in-the-shadows-50: #ffebf3;
  --color-what-we-do-in-the-shadows-100: #ffdce6;
  --color-what-we-do-in-the-shadows-200: #f5c5d1;
  --color-what-we-do-in-the-shadows-300: #dea5b4;
  --color-what-we-do-in-the-shadows-400: #c9899c;
  --color-what-we-do-in-the-shadows-500: #b56d84;
  --color-what-we-do-in-the-shadows-600: #995d70;
  --color-what-we-do-in-the-shadows-700: #7b4a59;
  --color-what-we-do-in-the-shadows-800: #5b3542;
  --color-what-we-do-in-the-shadows-900: #3f242e;
  --color-what-we-do-in-the-shadows-950: #28131b;
}

SCSS

$what-we-do-in-the-shadows: #370119;
$what-we-do-in-the-shadows-rgb: 55, 1, 25;
$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);
}