#4B72D2

CSS

:root {
  --skies-of-cyberspace: #4b72d2;
  --skies-of-cyberspace-rgb: 75 114 210;
  --skies-of-cyberspace-oklch: oklch(0.572 0.154 265.2);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(223 60% 56%);
  border-color: oklch(0.572 0.154 265.2);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4b72d2;
  --color-skies-of-cyberspace-50: #e1f5ff;
  --color-skies-of-cyberspace-100: #d1e7ff;
  --color-skies-of-cyberspace-200: #b7d3ff;
  --color-skies-of-cyberspace-300: #94b4ff;
  --color-skies-of-cyberspace-400: #729af9;
  --color-skies-of-cyberspace-500: #547feb;
  --color-skies-of-cyberspace-600: #476cc6;
  --color-skies-of-cyberspace-700: #39569f;
  --color-skies-of-cyberspace-800: #254077;
  --color-skies-of-cyberspace-900: #192c54;
  --color-skies-of-cyberspace-950: #0a1939;
}

SCSS

$skies-of-cyberspace: #4b72d2;
$skies-of-cyberspace-rgb: 75, 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);
}