#7C43C7

CSS

:root {
  --purple-rain: #7c43c7;
  --purple-rain-rgb: 124 67 199;
  --purple-rain-oklch: oklch(0.521 0.195 299.3);
}

.element {
  color: var(--purple-rain);
  background-color: hsl(266 54% 52%);
  border-color: oklch(0.521 0.195 299.3);
}

Tailwind CSS v4

@theme {
  --color-purple-rain: #7c43c7;
  --color-purple-rain-50: #ffe9ff;
  --color-purple-rain-100: #f3d9ff;
  --color-purple-rain-200: #e3c0ff;
  --color-purple-rain-300: #c99eff;
  --color-purple-rain-400: #b07fff;
  --color-purple-rain-500: #9b5df2;
  --color-purple-rain-600: #834fcc;
  --color-purple-rain-700: #693fa4;
  --color-purple-rain-800: #4b2e7c;
  --color-purple-rain-900: #341f58;
  --color-purple-rain-950: #200e3b;
}

SCSS

$purple-rain: #7c43c7;
$purple-rain-rgb: 124, 67, 199;
$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);
}