#2B0733

CSS

:root {
  --dark-purple: #2b0733;
  --dark-purple-rgb: 43 7 51;
  --dark-purple-oklch: oklch(0.22 0.087 319.7);
}

.element {
  color: var(--dark-purple);
  background-color: hsl(289 76% 11%);
  border-color: oklch(0.22 0.087 319.7);
}

Tailwind CSS v4

@theme {
  --color-dark-purple: #2b0733;
  --color-dark-purple-50: #ffedff;
  --color-dark-purple-100: #f6dffa;
  --color-dark-purple-200: #e6c9eb;
  --color-dark-purple-300: #cda9d3;
  --color-dark-purple-400: #b58ebf;
  --color-dark-purple-500: #a073aa;
  --color-dark-purple-600: #876190;
  --color-dark-purple-700: #6c4e73;
  --color-dark-purple-800: #4f3956;
  --color-dark-purple-900: #37273c;
  --color-dark-purple-950: #221526;
}

SCSS

$dark-purple: #2b0733;
$dark-purple-rgb: 43, 7, 51;
$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);
}