#4470D3

CSS

:root {
  --skies-of-cyberspace: #4470d3;
  --skies-of-cyberspace-rgb: 68 112 211;
  --skies-of-cyberspace-oklch: oklch(0.565 0.16 264);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(222 62% 55%);
  border-color: oklch(0.565 0.16 264);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4470d3;
  --color-skies-of-cyberspace-50: #e0f5ff;
  --color-skies-of-cyberspace-100: #cfe8ff;
  --color-skies-of-cyberspace-200: #b4d3ff;
  --color-skies-of-cyberspace-300: #91b5ff;
  --color-skies-of-cyberspace-400: #6d9bfc;
  --color-skies-of-cyberspace-500: #4e7fef;
  --color-skies-of-cyberspace-600: #426cc9;
  --color-skies-of-cyberspace-700: #3556a2;
  --color-skies-of-cyberspace-800: #224079;
  --color-skies-of-cyberspace-900: #162c55;
  --color-skies-of-cyberspace-950: #08193a;
}

SCSS

$skies-of-cyberspace: #4470d3;
$skies-of-cyberspace-rgb: 68, 112, 211;
$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);
}