#2D003D

CSS

:root {
  --dark-purple: #2d003d;
  --dark-purple-rgb: 45 0 61;
  --dark-purple-oklch: oklch(0.223 0.11 314.7);
}

.element {
  color: var(--dark-purple);
  background-color: hsl(284 100% 12%);
  border-color: oklch(0.223 0.11 314.7);
}

Tailwind CSS v4

@theme {
  --color-dark-purple: #2d003d;
  --color-dark-purple-50: #ffecff;
  --color-dark-purple-100: #f7ddff;
  --color-dark-purple-200: #e7c6f4;
  --color-dark-purple-300: #cea6dd;
  --color-dark-purple-400: #b78acb;
  --color-dark-purple-500: #a16eb8;
  --color-dark-purple-600: #885e9b;
  --color-dark-purple-700: #6d4b7d;
  --color-dark-purple-800: #4f365d;
  --color-dark-purple-900: #372541;
  --color-dark-purple-950: #22142a;
}

SCSS

$dark-purple: #2d003d;
$dark-purple-rgb: 45, 0, 61;
$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);
}