#C578FF

CSS

:root {
  --illicit-purple: #c578ff;
  --illicit-purple-rgb: 197 120 255;
  --illicit-purple-oklch: oklch(0.71 0.2 308.5);
}

.element {
  color: var(--illicit-purple);
  background-color: hsl(274 100% 74%);
  border-color: oklch(0.71 0.2 308.5);
}

Tailwind CSS v4

@theme {
  --color-illicit-purple: #c578ff;
  --color-illicit-purple-50: #ffe6ff;
  --color-illicit-purple-100: #fdd6ff;
  --color-illicit-purple-200: #efbcff;
  --color-illicit-purple-300: #d798ff;
  --color-illicit-purple-400: #c078f7;
  --color-illicit-purple-500: #ac54e9;
  --color-illicit-purple-600: #9148c4;
  --color-illicit-purple-700: #743a9e;
  --color-illicit-purple-800: #542977;
  --color-illicit-purple-900: #3b1c54;
  --color-illicit-purple-950: #250b39;
}

SCSS

$illicit-purple: #c578ff;
$illicit-purple-rgb: 197, 120, 255;
$illicit-purple-light: mix(#fff, $illicit-purple, 20%);
$illicit-purple-dark: mix(#000, $illicit-purple, 20%);

.element {
  color: $illicit-purple;
  box-shadow: 0 0 0 2px rgba($illicit-purple, 0.35);
}