#4773D3

CSS

:root {
  --skies-of-cyberspace: #4773d3;
  --skies-of-cyberspace-rgb: 71 115 211;
  --skies-of-cyberspace-oklch: oklch(0.573 0.156 263.7);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(221 61% 55%);
  border-color: oklch(0.573 0.156 263.7);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4773d3;
  --color-skies-of-cyberspace-50: #e0f5ff;
  --color-skies-of-cyberspace-100: #cfe8ff;
  --color-skies-of-cyberspace-200: #b5d3ff;
  --color-skies-of-cyberspace-300: #91b5ff;
  --color-skies-of-cyberspace-400: #6e9bfa;
  --color-skies-of-cyberspace-500: #4f80ec;
  --color-skies-of-cyberspace-600: #436dc7;
  --color-skies-of-cyberspace-700: #3557a0;
  --color-skies-of-cyberspace-800: #224077;
  --color-skies-of-cyberspace-900: #172c54;
  --color-skies-of-cyberspace-950: #081939;
}

SCSS

$skies-of-cyberspace: #4773d3;
$skies-of-cyberspace-rgb: 71, 115, 211;
$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);
}