#42375B

CSS

:root {
  --sanctum-of-shadows: #42375b;
  --sanctum-of-shadows-rgb: 66 55 91;
  --sanctum-of-shadows-oklch: oklch(0.365 0.062 297.3);
}

.element {
  color: var(--sanctum-of-shadows);
  background-color: hsl(258 25% 29%);
  border-color: oklch(0.365 0.062 297.3);
}

Tailwind CSS v4

@theme {
  --color-sanctum-of-shadows: #42375b;
  --color-sanctum-of-shadows-50: #f7f2ff;
  --color-sanctum-of-shadows-100: #eae4fa;
  --color-sanctum-of-shadows-200: #d8cfec;
  --color-sanctum-of-shadows-300: #bbb1d3;
  --color-sanctum-of-shadows-400: #a297bf;
  --color-sanctum-of-shadows-500: #8a7eab;
  --color-sanctum-of-shadows-600: #756a90;
  --color-sanctum-of-shadows-700: #5e5574;
  --color-sanctum-of-shadows-800: #443e56;
  --color-sanctum-of-shadows-900: #2f2b3c;
  --color-sanctum-of-shadows-950: #1b1826;
}

SCSS

$sanctum-of-shadows: #42375b;
$sanctum-of-shadows-rgb: 66, 55, 91;
$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);
}