#4972D4

CSS

:root {
  --skies-of-cyberspace: #4972d4;
  --skies-of-cyberspace-rgb: 73 114 212;
  --skies-of-cyberspace-oklch: oklch(0.573 0.157 264.8);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(222 62% 56%);
  border-color: oklch(0.573 0.157 264.8);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4972d4;
  --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: #709afb;
  --color-skies-of-cyberspace-500: #517fed;
  --color-skies-of-cyberspace-600: #456cc8;
  --color-skies-of-cyberspace-700: #3756a1;
  --color-skies-of-cyberspace-800: #244078;
  --color-skies-of-cyberspace-900: #182c55;
  --color-skies-of-cyberspace-950: #091939;
}

SCSS

$skies-of-cyberspace: #4972d4;
$skies-of-cyberspace-rgb: 73, 114, 212;
$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);
}