#4671DB

CSS

:root {
  --skies-of-cyberspace: #4671db;
  --skies-of-cyberspace-rgb: 70 113 219;
  --skies-of-cyberspace-oklch: oklch(0.574 0.169 264.9);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(223 67% 57%);
  border-color: oklch(0.574 0.169 264.9);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4671db;
  --color-skies-of-cyberspace-50: #dff5ff;
  --color-skies-of-cyberspace-100: #cee7ff;
  --color-skies-of-cyberspace-200: #b4d2ff;
  --color-skies-of-cyberspace-300: #90b4ff;
  --color-skies-of-cyberspace-400: #6d9aff;
  --color-skies-of-cyberspace-500: #4d7df5;
  --color-skies-of-cyberspace-600: #426bce;
  --color-skies-of-cyberspace-700: #3455a6;
  --color-skies-of-cyberspace-800: #213f7c;
  --color-skies-of-cyberspace-900: #162b58;
  --color-skies-of-cyberspace-950: #08183b;
}

SCSS

$skies-of-cyberspace: #4671db;
$skies-of-cyberspace-rgb: 70, 113, 219;
$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);
}