#4674CF

CSS

:root {
  --skies-of-cyberspace: #4674cf;
  --skies-of-cyberspace-rgb: 70 116 207;
  --skies-of-cyberspace-oklch: oklch(0.572 0.149 262.5);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(220 59% 54%);
  border-color: oklch(0.572 0.149 262.5);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4674cf;
  --color-skies-of-cyberspace-50: #e0f6ff;
  --color-skies-of-cyberspace-100: #cfe8ff;
  --color-skies-of-cyberspace-200: #b5d4ff;
  --color-skies-of-cyberspace-300: #91b6ff;
  --color-skies-of-cyberspace-400: #6e9cf6;
  --color-skies-of-cyberspace-500: #4e81e8;
  --color-skies-of-cyberspace-600: #436ec3;
  --color-skies-of-cyberspace-700: #35589d;
  --color-skies-of-cyberspace-800: #224175;
  --color-skies-of-cyberspace-900: #172d53;
  --color-skies-of-cyberspace-950: #081937;
}

SCSS

$skies-of-cyberspace: #4674cf;
$skies-of-cyberspace-rgb: 70, 116, 207;
$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);
}