#5472CC

CSS

:root {
  --skies-of-cyberspace: #5472cc;
  --skies-of-cyberspace-rgb: 84 114 204;
  --skies-of-cyberspace-oklch: oklch(0.573 0.143 267.9);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(225 54% 56%);
  border-color: oklch(0.573 0.143 267.9);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #5472cc;
  --color-skies-of-cyberspace-50: #e5f4ff;
  --color-skies-of-cyberspace-100: #d5e7ff;
  --color-skies-of-cyberspace-200: #bcd2ff;
  --color-skies-of-cyberspace-300: #9bb4ff;
  --color-skies-of-cyberspace-400: #7a9af3;
  --color-skies-of-cyberspace-500: #5d7fe4;
  --color-skies-of-cyberspace-600: #4f6cc0;
  --color-skies-of-cyberspace-700: #3f569b;
  --color-skies-of-cyberspace-800: #2b3f73;
  --color-skies-of-cyberspace-900: #1d2c51;
  --color-skies-of-cyberspace-950: #0d1836;
}

SCSS

$skies-of-cyberspace: #5472cc;
$skies-of-cyberspace-rgb: 84, 114, 204;
$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);
}