#4E71D6

CSS

:root {
  --skies-of-cyberspace: #4e71d6;
  --skies-of-cyberspace-rgb: 78 113 214;
  --skies-of-cyberspace-oklch: oklch(0.574 0.16 266.9);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(225 62% 57%);
  border-color: oklch(0.574 0.16 266.9);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4e71d6;
  --color-skies-of-cyberspace-50: #e2f4ff;
  --color-skies-of-cyberspace-100: #d2e7ff;
  --color-skies-of-cyberspace-200: #b8d2ff;
  --color-skies-of-cyberspace-300: #96b3ff;
  --color-skies-of-cyberspace-400: #7499fc;
  --color-skies-of-cyberspace-500: #567def;
  --color-skies-of-cyberspace-600: #496ac9;
  --color-skies-of-cyberspace-700: #3a55a2;
  --color-skies-of-cyberspace-800: #263f79;
  --color-skies-of-cyberspace-900: #1a2b55;
  --color-skies-of-cyberspace-950: #0b183a;
}

SCSS

$skies-of-cyberspace: #4e71d6;
$skies-of-cyberspace-rgb: 78, 113, 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);
}