#300133

CSS

:root {
  --dark-purple: #300133;
  --dark-purple-rgb: 48 1 51;
  --dark-purple-oklch: oklch(0.221 0.1 325.6);
}

.element {
  color: var(--dark-purple);
  background-color: hsl(296 96% 10%);
  border-color: oklch(0.221 0.1 325.6);
}

Tailwind CSS v4

@theme {
  --color-dark-purple: #300133;
  --color-dark-purple-50: #ffecff;
  --color-dark-purple-100: #fbddf9;
  --color-dark-purple-200: #ecc6eb;
  --color-dark-purple-300: #d4a6d2;
  --color-dark-purple-400: #bd8abf;
  --color-dark-purple-500: #a86eaa;
  --color-dark-purple-600: #8e5d90;
  --color-dark-purple-700: #724a73;
  --color-dark-purple-800: #533656;
  --color-dark-purple-900: #3a253c;
  --color-dark-purple-950: #241326;
}

SCSS

$dark-purple: #300133;
$dark-purple-rgb: 48, 1, 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);
}