#4E72D2

CSS

:root {
  --skies-of-cyberspace: #4e72d2;
  --skies-of-cyberspace-rgb: 78 114 210;
  --skies-of-cyberspace-oklch: oklch(0.574 0.153 266.2);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(224 59% 56%);
  border-color: oklch(0.574 0.153 266.2);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4e72d2;
  --color-skies-of-cyberspace-50: #e2f5ff;
  --color-skies-of-cyberspace-100: #d2e7ff;
  --color-skies-of-cyberspace-200: #b8d2ff;
  --color-skies-of-cyberspace-300: #96b4ff;
  --color-skies-of-cyberspace-400: #749af9;
  --color-skies-of-cyberspace-500: #567fea;
  --color-skies-of-cyberspace-600: #4a6cc6;
  --color-skies-of-cyberspace-700: #3a569f;
  --color-skies-of-cyberspace-800: #273f77;
  --color-skies-of-cyberspace-900: #1a2c54;
  --color-skies-of-cyberspace-950: #0b1838;
}

SCSS

$skies-of-cyberspace: #4e72d2;
$skies-of-cyberspace-rgb: 78, 114, 210;
$skies-of-cyberspace-light: mix(#fff, $skies-of-cyberspace, 20%);
$skies-of-cyberspace-dark: mix(#000, $skies-of-cyberspace, 20%);

.element {
  color: $skies-of-cyberspace;
  box-shadow: 0 0 0 2px rgba($skies-of-cyberspace, 0.35);
}