#2D003E

CSS

:root {
  --dark-purple: #2d003e;
  --dark-purple-rgb: 45 0 62;
  --dark-purple-oklch: oklch(0.224 0.111 314);
}

.element {
  color: var(--dark-purple);
  background-color: hsl(284 100% 12%);
  border-color: oklch(0.224 0.111 314);
}

Tailwind CSS v4

@theme {
  --color-dark-purple: #2d003e;
  --color-dark-purple-50: #ffecff;
  --color-dark-purple-100: #f7ddff;
  --color-dark-purple-200: #e7c6f5;
  --color-dark-purple-300: #cea6de;
  --color-dark-purple-400: #b68acc;
  --color-dark-purple-500: #a16eb9;
  --color-dark-purple-600: #885e9c;
  --color-dark-purple-700: #6d4b7d;
  --color-dark-purple-800: #4f365e;
  --color-dark-purple-900: #372542;
  --color-dark-purple-950: #22142a;
}

SCSS

$dark-purple: #2d003e;
$dark-purple-rgb: 45, 0, 62;
$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);
}