#4972D6

CSS

:root {
  --skies-of-cyberspace: #4972d6;
  --skies-of-cyberspace-rgb: 73 114 214;
  --skies-of-cyberspace-oklch: oklch(0.574 0.16 265);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(223 63% 56%);
  border-color: oklch(0.574 0.16 265);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4972d6;
  --color-skies-of-cyberspace-50: #e1f5ff;
  --color-skies-of-cyberspace-100: #d0e7ff;
  --color-skies-of-cyberspace-200: #b5d3ff;
  --color-skies-of-cyberspace-300: #93b4ff;
  --color-skies-of-cyberspace-400: #6f9afd;
  --color-skies-of-cyberspace-500: #517fef;
  --color-skies-of-cyberspace-600: #456bc9;
  --color-skies-of-cyberspace-700: #3756a2;
  --color-skies-of-cyberspace-800: #233f79;
  --color-skies-of-cyberspace-900: #172c55;
  --color-skies-of-cyberspace-950: #09183a;
}

SCSS

$skies-of-cyberspace: #4972d6;
$skies-of-cyberspace-rgb: 73, 114, 214;
$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);
}