#6F3EC7

CSS

:root {
  --purple-rain: #6f3ec7;
  --purple-rain-rgb: 111 62 199;
  --purple-rain-oklch: oklch(0.501 0.2 294.4);
}

.element {
  color: var(--purple-rain);
  background-color: hsl(261 55% 51%);
  border-color: oklch(0.501 0.2 294.4);
}

Tailwind CSS v4

@theme {
  --color-purple-rain: #6f3ec7;
  --color-purple-rain-50: #faeaff;
  --color-purple-rain-100: #eedbff;
  --color-purple-rain-200: #dcc2ff;
  --color-purple-rain-300: #c2a0ff;
  --color-purple-rain-400: #a881ff;
  --color-purple-rain-500: #935ffa;
  --color-purple-rain-600: #7c51d3;
  --color-purple-rain-700: #6341aa;
  --color-purple-rain-800: #472f80;
  --color-purple-rain-900: #31205b;
  --color-purple-rain-950: #1d0f3e;
}

SCSS

$purple-rain: #6f3ec7;
$purple-rain-rgb: 111, 62, 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);
}