#674B88

CSS

:root {
  --lords-of-the-night: #674b88;
  --lords-of-the-night-rgb: 103 75 136;
  --lords-of-the-night-oklch: oklch(0.469 0.1 304);
}

.element {
  color: var(--lords-of-the-night);
  background-color: hsl(268 29% 41%);
  border-color: oklch(0.469 0.1 304);
}

Tailwind CSS v4

@theme {
  --color-lords-of-the-night: #674b88;
  --color-lords-of-the-night-50: #fceeff;
  --color-lords-of-the-night-100: #f0e0ff;
  --color-lords-of-the-night-200: #dfcaf7;
  --color-lords-of-the-night-300: #c4abe1;
  --color-lords-of-the-night-400: #ab90cf;
  --color-lords-of-the-night-500: #9575bc;
  --color-lords-of-the-night-600: #7e639f;
  --color-lords-of-the-night-700: #654f7f;
  --color-lords-of-the-night-800: #493a5f;
  --color-lords-of-the-night-900: #322743;
  --color-lords-of-the-night-950: #1e152b;
}

SCSS

$lords-of-the-night: #674b88;
$lords-of-the-night-rgb: 103, 75, 136;
$lords-of-the-night-light: mix(#fff, $lords-of-the-night, 20%);
$lords-of-the-night-dark: mix(#000, $lords-of-the-night, 20%);

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