#3A283F

CSS

:root {
  --sanctum-of-shadows: #3a283f;
  --sanctum-of-shadows-rgb: 58 40 63;
  --sanctum-of-shadows-oklch: oklch(0.308 0.047 318.8);
}

.element {
  color: var(--sanctum-of-shadows);
  background-color: hsl(287 22% 20%);
  border-color: oklch(0.308 0.047 318.8);
}

Tailwind CSS v4

@theme {
  --color-sanctum-of-shadows: #3a283f;
  --color-sanctum-of-shadows-50: #fcf1fe;
  --color-sanctum-of-shadows-100: #efe3f2;
  --color-sanctum-of-shadows-200: #decee1;
  --color-sanctum-of-shadows-300: #c3b0c6;
  --color-sanctum-of-shadows-400: #ab96b1;
  --color-sanctum-of-shadows-500: #947d9a;
  --color-sanctum-of-shadows-600: #7d6a83;
  --color-sanctum-of-shadows-700: #645469;
  --color-sanctum-of-shadows-800: #493d4d;
  --color-sanctum-of-shadows-900: #332a36;
  --color-sanctum-of-shadows-950: #1e1821;
}

SCSS

$sanctum-of-shadows: #3a283f;
$sanctum-of-shadows-rgb: 58, 40, 63;
$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);
}