#8551C9

CSS

:root {
  --purple-rain: #8551c9;
  --purple-rain-rgb: 133 81 201;
  --purple-rain-oklch: oklch(0.552 0.18 300.6);
}

.element {
  color: var(--purple-rain);
  background-color: hsl(266 53% 55%);
  border-color: oklch(0.552 0.18 300.6);
}

Tailwind CSS v4

@theme {
  --color-purple-rain: #8551c9;
  --color-purple-rain-50: #ffeaff;
  --color-purple-rain-100: #f3daff;
  --color-purple-rain-200: #e3c2ff;
  --color-purple-rain-300: #caa0ff;
  --color-purple-rain-400: #b181f7;
  --color-purple-rain-500: #9b61e9;
  --color-purple-rain-600: #8353c4;
  --color-purple-rain-700: #69429e;
  --color-purple-rain-800: #4c3077;
  --color-purple-rain-900: #342154;
  --color-purple-rain-950: #200f38;
}

SCSS

$purple-rain: #8551c9;
$purple-rain-rgb: 133, 81, 201;
$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);
}