#3472D7

CSS

:root {
  --skies-of-cyberspace: #3472d7;
  --skies-of-cyberspace-rgb: 52 114 215;
  --skies-of-cyberspace-oklch: oklch(0.566 0.168 259.8);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(217 67% 52%);
  border-color: oklch(0.566 0.168 259.8);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #3472d7;
  --color-skies-of-cyberspace-50: #dbf6ff;
  --color-skies-of-cyberspace-100: #c9e9ff;
  --color-skies-of-cyberspace-200: #add5ff;
  --color-skies-of-cyberspace-300: #87b7ff;
  --color-skies-of-cyberspace-400: #609dff;
  --color-skies-of-cyberspace-500: #3c81f3;
  --color-skies-of-cyberspace-600: #346ecd;
  --color-skies-of-cyberspace-700: #2958a5;
  --color-skies-of-cyberspace-800: #18417b;
  --color-skies-of-cyberspace-900: #0f2d57;
  --color-skies-of-cyberspace-950: #03193b;
}

SCSS

$skies-of-cyberspace: #3472d7;
$skies-of-cyberspace-rgb: 52, 114, 215;
$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);
}