#C678FD

CSS

:root {
  --illicit-purple: #c678fd;
  --illicit-purple-rgb: 198 120 253;
  --illicit-purple-oklch: oklch(0.71 0.198 309.3);
}

.element {
  color: var(--illicit-purple);
  background-color: hsl(275 97% 73%);
  border-color: oklch(0.71 0.198 309.3);
}

Tailwind CSS v4

@theme {
  --color-illicit-purple: #c678fd;
  --color-illicit-purple-50: #ffe6ff;
  --color-illicit-purple-100: #fed6ff;
  --color-illicit-purple-200: #f0bcff;
  --color-illicit-purple-300: #d898ff;
  --color-illicit-purple-400: #c178f5;
  --color-illicit-purple-500: #ad54e6;
  --color-illicit-purple-600: #9248c2;
  --color-illicit-purple-700: #753a9c;
  --color-illicit-purple-800: #552a76;
  --color-illicit-purple-900: #3b1c53;
  --color-illicit-purple-950: #250b38;
}

SCSS

$illicit-purple: #c678fd;
$illicit-purple-rgb: 198, 120, 253;
$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);
}