#2C0438

CSS

:root {
  --dark-purple: #2c0438;
  --dark-purple-rgb: 44 4 56;
  --dark-purple-oklch: oklch(0.222 0.098 316.9);
}

.element {
  color: var(--dark-purple);
  background-color: hsl(286 87% 12%);
  border-color: oklch(0.222 0.098 316.9);
}

Tailwind CSS v4

@theme {
  --color-dark-purple: #2c0438;
  --color-dark-purple-50: #ffedff;
  --color-dark-purple-100: #f7defd;
  --color-dark-purple-200: #e7c8ef;
  --color-dark-purple-300: #cda8d8;
  --color-dark-purple-400: #b68cc5;
  --color-dark-purple-500: #a071b1;
  --color-dark-purple-600: #876096;
  --color-dark-purple-700: #6d4c78;
  --color-dark-purple-800: #4f385a;
  --color-dark-purple-900: #37263f;
  --color-dark-purple-950: #221428;
}

SCSS

$dark-purple: #2c0438;
$dark-purple-rgb: 44, 4, 56;
$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);
}