#4873D2

CSS

:root {
  --skies-of-cyberspace: #4873d2;
  --skies-of-cyberspace-rgb: 72 115 210;
  --skies-of-cyberspace-oklch: oklch(0.573 0.154 263.9);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(221 61% 55%);
  border-color: oklch(0.573 0.154 263.9);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4873d2;
  --color-skies-of-cyberspace-50: #e0f5ff;
  --color-skies-of-cyberspace-100: #d0e8ff;
  --color-skies-of-cyberspace-200: #b5d3ff;
  --color-skies-of-cyberspace-300: #92b5ff;
  --color-skies-of-cyberspace-400: #6f9bf9;
  --color-skies-of-cyberspace-500: #5080eb;
  --color-skies-of-cyberspace-600: #446dc6;
  --color-skies-of-cyberspace-700: #36579f;
  --color-skies-of-cyberspace-800: #234077;
  --color-skies-of-cyberspace-900: #172c54;
  --color-skies-of-cyberspace-950: #081938;
}

SCSS

$skies-of-cyberspace: #4873d2;
$skies-of-cyberspace-rgb: 72, 115, 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);
}