#4573C6

CSS

:root {
  --skies-of-cyberspace: #4573c6;
  --skies-of-cyberspace-rgb: 69 115 198;
  --skies-of-cyberspace-oklch: oklch(0.564 0.138 261.2);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(219 53% 52%);
  border-color: oklch(0.564 0.138 261.2);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4573c6;
  --color-skies-of-cyberspace-50: #e1f6ff;
  --color-skies-of-cyberspace-100: #d0e9ff;
  --color-skies-of-cyberspace-200: #b5d5ff;
  --color-skies-of-cyberspace-300: #92b7ff;
  --color-skies-of-cyberspace-400: #6f9ef0;
  --color-skies-of-cyberspace-500: #4f83e1;
  --color-skies-of-cyberspace-600: #446fbe;
  --color-skies-of-cyberspace-700: #365998;
  --color-skies-of-cyberspace-800: #234272;
  --color-skies-of-cyberspace-900: #172d50;
  --color-skies-of-cyberspace-950: #081a35;
}

SCSS

$skies-of-cyberspace: #4573c6;
$skies-of-cyberspace-rgb: 69, 115, 198;
$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);
}