#5B0059

CSS

:root {
  --cloak-and-dagger: #5b0059;
  --cloak-and-dagger-rgb: 91 0 89;
  --cloak-and-dagger-oklch: oklch(0.329 0.15 329.5);
}

.element {
  color: var(--cloak-and-dagger);
  background-color: hsl(301 100% 18%);
  border-color: oklch(0.329 0.15 329.5);
}

Tailwind CSS v4

@theme {
  --color-cloak-and-dagger: #5b0059;
  --color-cloak-and-dagger-50: #ffe6ff;
  --color-cloak-and-dagger-100: #ffd6ff;
  --color-cloak-and-dagger-200: #fbbdf2;
  --color-cloak-and-dagger-300: #e49ada;
  --color-cloak-and-dagger-400: #cf7cc9;
  --color-cloak-and-dagger-500: #bb5cb6;
  --color-cloak-and-dagger-600: #9e4e99;
  --color-cloak-and-dagger-700: #7f3e7b;
  --color-cloak-and-dagger-800: #5d2d5d;
  --color-cloak-and-dagger-900: #411e41;
  --color-cloak-and-dagger-950: #2a0e2a;
}

SCSS

$cloak-and-dagger: #5b0059;
$cloak-and-dagger-rgb: 91, 0, 89;
$cloak-and-dagger-light: mix(#fff, $cloak-and-dagger, 20%);
$cloak-and-dagger-dark: mix(#000, $cloak-and-dagger, 20%);

.element {
  color: $cloak-and-dagger;
  box-shadow: 0 0 0 2px rgba($cloak-and-dagger, 0.35);
}