#4870D1

CSS

:root {
  --skies-of-cyberspace: #4870d1;
  --skies-of-cyberspace-rgb: 72 112 209;
  --skies-of-cyberspace-oklch: oklch(0.566 0.156 265);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(222 60% 55%);
  border-color: oklch(0.566 0.156 265);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4870d1;
  --color-skies-of-cyberspace-50: #e1f5ff;
  --color-skies-of-cyberspace-100: #d0e7ff;
  --color-skies-of-cyberspace-200: #b6d3ff;
  --color-skies-of-cyberspace-300: #93b4ff;
  --color-skies-of-cyberspace-400: #719afa;
  --color-skies-of-cyberspace-500: #527fec;
  --color-skies-of-cyberspace-600: #466cc7;
  --color-skies-of-cyberspace-700: #3856a0;
  --color-skies-of-cyberspace-800: #244078;
  --color-skies-of-cyberspace-900: #182c55;
  --color-skies-of-cyberspace-950: #091939;
}

SCSS

$skies-of-cyberspace: #4870d1;
$skies-of-cyberspace-rgb: 72, 112, 209;
$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);
}