#370117

CSS

:root {
  --what-we-do-in-the-shadows: #370117;
  --what-we-do-in-the-shadows-rgb: 55 1 23;
  --what-we-do-in-the-shadows-oklch: oklch(0.219 0.086 2.3);
}

.element {
  color: var(--what-we-do-in-the-shadows);
  background-color: hsl(336 96% 11%);
  border-color: oklch(0.219 0.086 2.3);
}

Tailwind CSS v4

@theme {
  --color-what-we-do-in-the-shadows: #370117;
  --color-what-we-do-in-the-shadows-50: #ffecf2;
  --color-what-we-do-in-the-shadows-100: #ffdde4;
  --color-what-we-do-in-the-shadows-200: #f6c6d0;
  --color-what-we-do-in-the-shadows-300: #dea5b2;
  --color-what-we-do-in-the-shadows-400: #ca899a;
  --color-what-we-do-in-the-shadows-500: #b56d81;
  --color-what-we-do-in-the-shadows-600: #995d6d;
  --color-what-we-do-in-the-shadows-700: #7b4a57;
  --color-what-we-do-in-the-shadows-800: #5b3541;
  --color-what-we-do-in-the-shadows-900: #40242d;
  --color-what-we-do-in-the-shadows-950: #28131a;
}

SCSS

$what-we-do-in-the-shadows: #370117;
$what-we-do-in-the-shadows-rgb: 55, 1, 23;
$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);
}