#2B0536

CSS

:root {
  --dark-purple: #2b0536;
  --dark-purple-rgb: 43 5 54;
  --dark-purple-oklch: oklch(0.219 0.094 317.3);
}

.element {
  color: var(--dark-purple);
  background-color: hsl(287 83% 12%);
  border-color: oklch(0.219 0.094 317.3);
}

Tailwind CSS v4

@theme {
  --color-dark-purple: #2b0536;
  --color-dark-purple-50: #ffedff;
  --color-dark-purple-100: #f6defc;
  --color-dark-purple-200: #e6c8ee;
  --color-dark-purple-300: #cda8d6;
  --color-dark-purple-400: #b58dc3;
  --color-dark-purple-500: #a072af;
  --color-dark-purple-600: #876194;
  --color-dark-purple-700: #6c4d77;
  --color-dark-purple-800: #4f3859;
  --color-dark-purple-900: #37263e;
  --color-dark-purple-950: #221527;
}

SCSS

$dark-purple: #2b0536;
$dark-purple-rgb: 43, 5, 54;
$dark-purple-light: mix(#fff, $dark-purple, 20%);
$dark-purple-dark: mix(#000, $dark-purple, 20%);

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