#2C003F

CSS

:root {
  --dark-purple: #2c003f;
  --dark-purple-rgb: 44 0 63;
  --dark-purple-oklch: oklch(0.223 0.111 312.3);
}

.element {
  color: var(--dark-purple);
  background-color: hsl(282 100% 12%);
  border-color: oklch(0.223 0.111 312.3);
}

Tailwind CSS v4

@theme {
  --color-dark-purple: #2c003f;
  --color-dark-purple-50: #ffecff;
  --color-dark-purple-100: #f6ddff;
  --color-dark-purple-200: #e6c7f6;
  --color-dark-purple-300: #cda7df;
  --color-dark-purple-400: #b58bce;
  --color-dark-purple-500: #9f6fbb;
  --color-dark-purple-600: #865e9e;
  --color-dark-purple-700: #6c4b7f;
  --color-dark-purple-800: #4e375f;
  --color-dark-purple-900: #362543;
  --color-dark-purple-950: #21142b;
}

SCSS

$dark-purple: #2c003f;
$dark-purple-rgb: 44, 0, 63;
$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);
}