#2F0137

CSS

:root {
  --dark-purple: #2f0137;
  --dark-purple-rgb: 47 1 55;
  --dark-purple-oklch: oklch(0.222 0.103 321.2);
}

.element {
  color: var(--dark-purple);
  background-color: hsl(291 96% 11%);
  border-color: oklch(0.222 0.103 321.2);
}

Tailwind CSS v4

@theme {
  --color-dark-purple: #2f0137;
  --color-dark-purple-50: #ffecff;
  --color-dark-purple-100: #f9ddfc;
  --color-dark-purple-200: #eac6ee;
  --color-dark-purple-300: #d2a6d6;
  --color-dark-purple-400: #bb8ac4;
  --color-dark-purple-500: #a56eb0;
  --color-dark-purple-600: #8c5e94;
  --color-dark-purple-700: #704b77;
  --color-dark-purple-800: #523659;
  --color-dark-purple-900: #39253e;
  --color-dark-purple-950: #231327;
}

SCSS

$dark-purple: #2f0137;
$dark-purple-rgb: 47, 1, 55;
$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);
}