#4874CE

CSS

:root {
  --skies-of-cyberspace: #4874ce;
  --skies-of-cyberspace-rgb: 72 116 206;
  --skies-of-cyberspace-oklch: oklch(0.573 0.147 263);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(220 58% 55%);
  border-color: oklch(0.573 0.147 263);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4874ce;
  --color-skies-of-cyberspace-50: #e1f5ff;
  --color-skies-of-cyberspace-100: #d0e8ff;
  --color-skies-of-cyberspace-200: #b6d4ff;
  --color-skies-of-cyberspace-300: #92b6ff;
  --color-skies-of-cyberspace-400: #6f9cf5;
  --color-skies-of-cyberspace-500: #5081e6;
  --color-skies-of-cyberspace-600: #446ec2;
  --color-skies-of-cyberspace-700: #36589c;
  --color-skies-of-cyberspace-800: #234175;
  --color-skies-of-cyberspace-900: #172d52;
  --color-skies-of-cyberspace-950: #091937;
}

SCSS

$skies-of-cyberspace: #4874ce;
$skies-of-cyberspace-rgb: 72, 116, 206;
$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);
}