#3A2940

CSS

:root {
  --sanctum-of-shadows: #3a2940;
  --sanctum-of-shadows-rgb: 58 41 64;
  --sanctum-of-shadows-oklch: oklch(0.311 0.046 317.1);
}

.element {
  color: var(--sanctum-of-shadows);
  background-color: hsl(284 22% 21%);
  border-color: oklch(0.311 0.046 317.1);
}

Tailwind CSS v4

@theme {
  --color-sanctum-of-shadows: #3a2940;
  --color-sanctum-of-shadows-50: #fbf1fe;
  --color-sanctum-of-shadows-100: #efe3f2;
  --color-sanctum-of-shadows-200: #ddcee1;
  --color-sanctum-of-shadows-300: #c2b0c7;
  --color-sanctum-of-shadows-400: #aa96b1;
  --color-sanctum-of-shadows-500: #937d9b;
  --color-sanctum-of-shadows-600: #7c6a83;
  --color-sanctum-of-shadows-700: #635569;
  --color-sanctum-of-shadows-800: #493e4e;
  --color-sanctum-of-shadows-900: #322a36;
  --color-sanctum-of-shadows-950: #1e1821;
}

SCSS

$sanctum-of-shadows: #3a2940;
$sanctum-of-shadows-rgb: 58, 41, 64;
$sanctum-of-shadows-light: mix(#fff, $sanctum-of-shadows, 20%);
$sanctum-of-shadows-dark: mix(#000, $sanctum-of-shadows, 20%);

.element {
  color: $sanctum-of-shadows;
  box-shadow: 0 0 0 2px rgba($sanctum-of-shadows, 0.35);
}