#6B45CB

CSS

:root {
  --purple-rain: #6b45cb;
  --purple-rain-rgb: 107 69 203;
  --purple-rain-oklch: oklch(0.51 0.196 290.8);
}

.element {
  color: var(--purple-rain);
  background-color: hsl(257 56% 53%);
  border-color: oklch(0.51 0.196 290.8);
}

Tailwind CSS v4

@theme {
  --color-purple-rain: #6b45cb;
  --color-purple-rain-50: #f6ecff;
  --color-purple-rain-100: #eadcff;
  --color-purple-rain-200: #d7c4ff;
  --color-purple-rain-300: #bca2ff;
  --color-purple-rain-400: #a184ff;
  --color-purple-rain-500: #8b63fb;
  --color-purple-rain-600: #7555d4;
  --color-purple-rain-700: #5e44aa;
  --color-purple-rain-800: #433181;
  --color-purple-rain-900: #2e225b;
  --color-purple-rain-950: #1b103e;
}

SCSS

$purple-rain: #6b45cb;
$purple-rain-rgb: 107, 69, 203;
$purple-rain-light: mix(#fff, $purple-rain, 20%);
$purple-rain-dark: mix(#000, $purple-rain, 20%);

.element {
  color: $purple-rain;
  box-shadow: 0 0 0 2px rgba($purple-rain, 0.35);
}