#2C0436

CSS

:root {
  --dark-purple: #2c0436;
  --dark-purple-rgb: 44 4 54;
  --dark-purple-oklch: oklch(0.22 0.096 318.6);
}

.element {
  color: var(--dark-purple);
  background-color: hsl(288 86% 11%);
  border-color: oklch(0.22 0.096 318.6);
}

Tailwind CSS v4

@theme {
  --color-dark-purple: #2c0436;
  --color-dark-purple-50: #ffedff;
  --color-dark-purple-100: #f7defc;
  --color-dark-purple-200: #e7c7ee;
  --color-dark-purple-300: #cea8d6;
  --color-dark-purple-400: #b78cc3;
  --color-dark-purple-500: #a171af;
  --color-dark-purple-600: #886094;
  --color-dark-purple-700: #6d4c76;
  --color-dark-purple-800: #503859;
  --color-dark-purple-900: #37263e;
  --color-dark-purple-950: #221427;
}

SCSS

$dark-purple: #2c0436;
$dark-purple-rgb: 44, 4, 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);
}