#4D72D3

CSS

:root {
  --skies-of-cyberspace: #4d72d3;
  --skies-of-cyberspace-rgb: 77 114 211;
  --skies-of-cyberspace-oklch: oklch(0.574 0.155 266);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(223 60% 56%);
  border-color: oklch(0.574 0.155 266);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4d72d3;
  --color-skies-of-cyberspace-50: #e2f5ff;
  --color-skies-of-cyberspace-100: #d2e7ff;
  --color-skies-of-cyberspace-200: #b8d2ff;
  --color-skies-of-cyberspace-300: #95b4ff;
  --color-skies-of-cyberspace-400: #739afa;
  --color-skies-of-cyberspace-500: #557fec;
  --color-skies-of-cyberspace-600: #496bc7;
  --color-skies-of-cyberspace-700: #3a56a0;
  --color-skies-of-cyberspace-800: #263f77;
  --color-skies-of-cyberspace-900: #192c54;
  --color-skies-of-cyberspace-950: #0a1839;
}

SCSS

$skies-of-cyberspace: #4d72d3;
$skies-of-cyberspace-rgb: 77, 114, 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);
}