#706DB0

CSS

:root {
  --twinkle-night: #706db0;
  --twinkle-night-rgb: 112 109 176;
  --twinkle-night-oklch: oklch(0.566 0.102 284.7);
}

.element {
  color: var(--twinkle-night);
  background-color: hsl(243 30% 56%);
  border-color: oklch(0.566 0.102 284.7);
}

Tailwind CSS v4

@theme {
  --color-twinkle-night: #706db0;
  --color-twinkle-night-50: #f2f1ff;
  --color-twinkle-night-100: #e5e4ff;
  --color-twinkle-night-200: #d0ceff;
  --color-twinkle-night-300: #b3b0ea;
  --color-twinkle-night-400: #9896d9;
  --color-twinkle-night-500: #7f7cc7;
  --color-twinkle-night-600: #6c69a8;
  --color-twinkle-night-700: #565487;
  --color-twinkle-night-800: #3d3d65;
  --color-twinkle-night-900: #2a2a47;
  --color-twinkle-night-950: #18182e;
}

SCSS

$twinkle-night: #706db0;
$twinkle-night-rgb: 112, 109, 176;
$twinkle-night-light: mix(#fff, $twinkle-night, 20%);
$twinkle-night-dark: mix(#000, $twinkle-night, 20%);

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