#3A0018

CSS

:root {
  --what-we-do-in-the-shadows: #3a0018;
  --what-we-do-in-the-shadows-rgb: 58 0 24;
  --what-we-do-in-the-shadows-oklch: oklch(0.225 0.091 2.5);
}

.element {
  color: var(--what-we-do-in-the-shadows);
  background-color: hsl(335 100% 11%);
  border-color: oklch(0.225 0.091 2.5);
}

Tailwind CSS v4

@theme {
  --color-what-we-do-in-the-shadows: #3a0018;
  --color-what-we-do-in-the-shadows-50: #ffebf2;
  --color-what-we-do-in-the-shadows-100: #ffdce4;
  --color-what-we-do-in-the-shadows-200: #f7c5cf;
  --color-what-we-do-in-the-shadows-300: #e0a4b1;
  --color-what-we-do-in-the-shadows-400: #cc889a;
  --color-what-we-do-in-the-shadows-500: #b86c81;
  --color-what-we-do-in-the-shadows-600: #9b5b6d;
  --color-what-we-do-in-the-shadows-700: #7d4957;
  --color-what-we-do-in-the-shadows-800: #5c3541;
  --color-what-we-do-in-the-shadows-900: #40242d;
  --color-what-we-do-in-the-shadows-950: #29131a;
}

SCSS

$what-we-do-in-the-shadows: #3a0018;
$what-we-do-in-the-shadows-rgb: 58, 0, 24;
$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);
}