#6773AD

CSS

:root {
  --twinkle-night: #6773ad;
  --twinkle-night-rgb: 103 115 173;
  --twinkle-night-oklch: oklch(0.57 0.091 274.3);
}

.element {
  color: var(--twinkle-night);
  background-color: hsl(230 30% 54%);
  border-color: oklch(0.57 0.091 274.3);
}

Tailwind CSS v4

@theme {
  --color-twinkle-night: #6773ad;
  --color-twinkle-night-50: #eef4ff;
  --color-twinkle-night-100: #dfe6ff;
  --color-twinkle-night-200: #c9d2fc;
  --color-twinkle-night-300: #aab4e6;
  --color-twinkle-night-400: #8e9bd4;
  --color-twinkle-night-500: #7481c2;
  --color-twinkle-night-600: #626da4;
  --color-twinkle-night-700: #4e5784;
  --color-twinkle-night-800: #374062;
  --color-twinkle-night-900: #262c45;
  --color-twinkle-night-950: #14192d;
}

SCSS

$twinkle-night: #6773ad;
$twinkle-night-rgb: 103, 115, 173;
$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);
}