#3F304B

CSS

:root {
  --sanctum-of-shadows: #3f304b;
  --sanctum-of-shadows-rgb: 63 48 75;
  --sanctum-of-shadows-oklch: oklch(0.338 0.05 309.3);
}

.element {
  color: var(--sanctum-of-shadows);
  background-color: hsl(273 22% 24%);
  border-color: oklch(0.338 0.05 309.3);
}

Tailwind CSS v4

@theme {
  --color-sanctum-of-shadows: #3f304b;
  --color-sanctum-of-shadows-50: #faf1ff;
  --color-sanctum-of-shadows-100: #ede3f5;
  --color-sanctum-of-shadows-200: #dbcfe4;
  --color-sanctum-of-shadows-300: #c0b1cb;
  --color-sanctum-of-shadows-400: #a797b5;
  --color-sanctum-of-shadows-500: #907da0;
  --color-sanctum-of-shadows-600: #7a6a87;
  --color-sanctum-of-shadows-700: #61556c;
  --color-sanctum-of-shadows-800: #473e50;
  --color-sanctum-of-shadows-900: #312b38;
  --color-sanctum-of-shadows-950: #1d1822;
}

SCSS

$sanctum-of-shadows: #3f304b;
$sanctum-of-shadows-rgb: 63, 48, 75;
$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);
}