#4B72C8

CSS

:root {
  --skies-of-cyberspace: #4b72c8;
  --skies-of-cyberspace-rgb: 75 114 200;
  --skies-of-cyberspace-oklch: oklch(0.566 0.14 264.1);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(221 53% 54%);
  border-color: oklch(0.566 0.14 264.1);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4b72c8;
  --color-skies-of-cyberspace-50: #e2f5ff;
  --color-skies-of-cyberspace-100: #d2e8ff;
  --color-skies-of-cyberspace-200: #b8d3ff;
  --color-skies-of-cyberspace-300: #96b6ff;
  --color-skies-of-cyberspace-400: #749cf1;
  --color-skies-of-cyberspace-500: #5681e2;
  --color-skies-of-cyberspace-600: #496ebf;
  --color-skies-of-cyberspace-700: #3a5899;
  --color-skies-of-cyberspace-800: #274172;
  --color-skies-of-cyberspace-900: #1a2d51;
  --color-skies-of-cyberspace-950: #0a1936;
}

SCSS

$skies-of-cyberspace: #4b72c8;
$skies-of-cyberspace-rgb: 75, 114, 200;
$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);
}