#6F72A9

CSS

:root {
  --twinkle-night: #6f72a9;
  --twinkle-night-rgb: 111 114 169;
  --twinkle-night-oklch: oklch(0.572 0.084 281);
}

.element {
  color: var(--twinkle-night);
  background-color: hsl(237 25% 55%);
  border-color: oklch(0.572 0.084 281);
}

Tailwind CSS v4

@theme {
  --color-twinkle-night: #6f72a9;
  --color-twinkle-night-50: #f1f3ff;
  --color-twinkle-night-100: #e3e5ff;
  --color-twinkle-night-200: #ced0f8;
  --color-twinkle-night-300: #b1b2e2;
  --color-twinkle-night-400: #9599d0;
  --color-twinkle-night-500: #7c7fbd;
  --color-twinkle-night-600: #696ca0;
  --color-twinkle-night-700: #545680;
  --color-twinkle-night-800: #3c3f5f;
  --color-twinkle-night-900: #292c43;
  --color-twinkle-night-950: #17192b;
}

SCSS

$twinkle-night: #6f72a9;
$twinkle-night-rgb: 111, 114, 169;
$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);
}