#4972C8

CSS

:root {
  --skies-of-cyberspace: #4972c8;
  --skies-of-cyberspace-rgb: 73 114 200;
  --skies-of-cyberspace-oklch: oklch(0.565 0.141 263.4);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(221 54% 54%);
  border-color: oklch(0.565 0.141 263.4);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4972c8;
  --color-skies-of-cyberspace-50: #e2f5ff;
  --color-skies-of-cyberspace-100: #d1e8ff;
  --color-skies-of-cyberspace-200: #b7d4ff;
  --color-skies-of-cyberspace-300: #95b6ff;
  --color-skies-of-cyberspace-400: #729cf1;
  --color-skies-of-cyberspace-500: #5482e3;
  --color-skies-of-cyberspace-600: #476ebf;
  --color-skies-of-cyberspace-700: #39589a;
  --color-skies-of-cyberspace-800: #254173;
  --color-skies-of-cyberspace-900: #192d51;
  --color-skies-of-cyberspace-950: #0a1936;
}

SCSS

$skies-of-cyberspace: #4972c8;
$skies-of-cyberspace-rgb: 73, 114, 200;
$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);
}