#350414

CSS

:root {
  --what-we-do-in-the-shadows: #350414;
  --what-we-do-in-the-shadows-rgb: 53 4 20;
  --what-we-do-in-the-shadows-oklch: oklch(0.218 0.078 6.7);
}

.element {
  color: var(--what-we-do-in-the-shadows);
  background-color: hsl(340 86% 11%);
  border-color: oklch(0.218 0.078 6.7);
}

Tailwind CSS v4

@theme {
  --color-what-we-do-in-the-shadows: #350414;
  --color-what-we-do-in-the-shadows-50: #ffedf0;
  --color-what-we-do-in-the-shadows-100: #ffdee2;
  --color-what-we-do-in-the-shadows-200: #f3c7cd;
  --color-what-we-do-in-the-shadows-300: #dca7af;
  --color-what-we-do-in-the-shadows-400: #c78b97;
  --color-what-we-do-in-the-shadows-500: #b2707e;
  --color-what-we-do-in-the-shadows-600: #975f6a;
  --color-what-we-do-in-the-shadows-700: #794c55;
  --color-what-we-do-in-the-shadows-800: #59373f;
  --color-what-we-do-in-the-shadows-900: #3f252b;
  --color-what-we-do-in-the-shadows-950: #281419;
}

SCSS

$what-we-do-in-the-shadows: #350414;
$what-we-do-in-the-shadows-rgb: 53, 4, 20;
$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);
}