#7071AA

CSS

:root {
  --twinkle-night: #7071aa;
  --twinkle-night-rgb: 112 113 170;
  --twinkle-night-oklch: oklch(0.571 0.087 282.5);
}

.element {
  color: var(--twinkle-night);
  background-color: hsl(239 25% 55%);
  border-color: oklch(0.571 0.087 282.5);
}

Tailwind CSS v4

@theme {
  --color-twinkle-night: #7071aa;
  --color-twinkle-night-50: #f2f2ff;
  --color-twinkle-night-100: #e4e5ff;
  --color-twinkle-night-200: #cfd0f9;
  --color-twinkle-night-300: #b2b2e3;
  --color-twinkle-night-400: #9698d1;
  --color-twinkle-night-500: #7d7fbf;
  --color-twinkle-night-600: #6a6ba1;
  --color-twinkle-night-700: #555681;
  --color-twinkle-night-800: #3d3f60;
  --color-twinkle-night-900: #2a2b43;
  --color-twinkle-night-950: #17182b;
}

SCSS

$twinkle-night: #7071aa;
$twinkle-night-rgb: 112, 113, 170;
$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);
}