#B583F1

CSS

:root {
  --illicit-purple: #b583f1;
  --illicit-purple-rgb: 181 131 241;
  --illicit-purple-oklch: oklch(0.703 0.162 303.5);
}

.element {
  color: var(--illicit-purple);
  background-color: hsl(267 80% 73%);
  border-color: oklch(0.703 0.162 303.5);
}

Tailwind CSS v4

@theme {
  --color-illicit-purple: #b583f1;
  --color-illicit-purple-50: #ffeaff;
  --color-illicit-purple-100: #f5dbff;
  --color-illicit-purple-200: #e5c3ff;
  --color-illicit-purple-300: #cba1f9;
  --color-illicit-purple-400: #b384ec;
  --color-illicit-purple-500: #9d65dc;
  --color-illicit-purple-600: #8556ba;
  --color-illicit-purple-700: #6b4595;
  --color-illicit-purple-800: #4d3270;
  --color-illicit-purple-900: #35224f;
  --color-illicit-purple-950: #211135;
}

SCSS

$illicit-purple: #b583f1;
$illicit-purple-rgb: 181, 131, 241;
$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);
}