#4872D7

CSS

:root {
  --skies-of-cyberspace: #4872d7;
  --skies-of-cyberspace-rgb: 72 114 215;
  --skies-of-cyberspace-oklch: oklch(0.574 0.162 264.8);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(222 64% 56%);
  border-color: oklch(0.574 0.162 264.8);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4872d7;
  --color-skies-of-cyberspace-50: #e0f5ff;
  --color-skies-of-cyberspace-100: #cfe7ff;
  --color-skies-of-cyberspace-200: #b5d3ff;
  --color-skies-of-cyberspace-300: #92b4ff;
  --color-skies-of-cyberspace-400: #6e9afd;
  --color-skies-of-cyberspace-500: #507ff0;
  --color-skies-of-cyberspace-600: #446bca;
  --color-skies-of-cyberspace-700: #3656a3;
  --color-skies-of-cyberspace-800: #233f7a;
  --color-skies-of-cyberspace-900: #172c56;
  --color-skies-of-cyberspace-950: #08183a;
}

SCSS

$skies-of-cyberspace: #4872d7;
$skies-of-cyberspace-rgb: 72, 114, 215;
$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);
}