#311240

CSS

:root {
  --dark-purple: #311240;
  --dark-purple-rgb: 49 18 64;
  --dark-purple-oklch: oklch(0.255 0.088 312.9);
}

.element {
  color: var(--dark-purple);
  background-color: hsl(280 56% 16%);
  border-color: oklch(0.255 0.088 312.9);
}

Tailwind CSS v4

@theme {
  --color-dark-purple: #311240;
  --color-dark-purple-50: #ffeeff;
  --color-dark-purple-100: #f3e0fd;
  --color-dark-purple-200: #e3caef;
  --color-dark-purple-300: #c9aad7;
  --color-dark-purple-400: #b18fc4;
  --color-dark-purple-500: #9a75b0;
  --color-dark-purple-600: #836394;
  --color-dark-purple-700: #694f77;
  --color-dark-purple-800: #4c3a59;
  --color-dark-purple-900: #35273e;
  --color-dark-purple-950: #201527;
}

SCSS

$dark-purple: #311240;
$dark-purple-rgb: 49, 18, 64;
$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);
}