#300037

CSS

:root {
  --dark-purple: #300037;
  --dark-purple-rgb: 48 0 55;
  --dark-purple-oklch: oklch(0.223 0.106 322.2);
}

.element {
  color: var(--dark-purple);
  background-color: hsl(292 100% 11%);
  border-color: oklch(0.223 0.106 322.2);
}

Tailwind CSS v4

@theme {
  --color-dark-purple: #300037;
  --color-dark-purple-50: #ffebff;
  --color-dark-purple-100: #faddfc;
  --color-dark-purple-200: #ecc5ee;
  --color-dark-purple-300: #d3a5d6;
  --color-dark-purple-400: #bc89c3;
  --color-dark-purple-500: #a76daf;
  --color-dark-purple-600: #8d5d94;
  --color-dark-purple-700: #714a77;
  --color-dark-purple-800: #533659;
  --color-dark-purple-900: #3a253e;
  --color-dark-purple-950: #241327;
}

SCSS

$dark-purple: #300037;
$dark-purple-rgb: 48, 0, 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);
}