#6C73A4

CSS

:root {
  --twinkle-night: #6c73a4;
  --twinkle-night-rgb: 108 115 164;
  --twinkle-night-oklch: oklch(0.569 0.076 277.4);
}

.element {
  color: var(--twinkle-night);
  background-color: hsl(233 24% 53%);
  border-color: oklch(0.569 0.076 277.4);
}

Tailwind CSS v4

@theme {
  --color-twinkle-night: #6c73a4;
  --color-twinkle-night-50: #f0f3ff;
  --color-twinkle-night-100: #e2e6ff;
  --color-twinkle-night-200: #cdd1f5;
  --color-twinkle-night-300: #afb4df;
  --color-twinkle-night-400: #939bcc;
  --color-twinkle-night-500: #7a81b8;
  --color-twinkle-night-600: #676e9c;
  --color-twinkle-night-700: #52587d;
  --color-twinkle-night-800: #3b405d;
  --color-twinkle-night-900: #282c41;
  --color-twinkle-night-950: #16192a;
}

SCSS

$twinkle-night: #6c73a4;
$twinkle-night-rgb: 108, 115, 164;
$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);
}