#4573C8

CSS

:root {
  --skies-of-cyberspace: #4573c8;
  --skies-of-cyberspace-rgb: 69 115 200;
  --skies-of-cyberspace-oklch: oklch(0.565 0.141 261.6);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(219 54% 53%);
  border-color: oklch(0.565 0.141 261.6);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4573c8;
  --color-skies-of-cyberspace-50: #e1f6ff;
  --color-skies-of-cyberspace-100: #d0e8ff;
  --color-skies-of-cyberspace-200: #b5d4ff;
  --color-skies-of-cyberspace-300: #92b7ff;
  --color-skies-of-cyberspace-400: #6f9df1;
  --color-skies-of-cyberspace-500: #4f83e3;
  --color-skies-of-cyberspace-600: #446fbf;
  --color-skies-of-cyberspace-700: #36599a;
  --color-skies-of-cyberspace-800: #234172;
  --color-skies-of-cyberspace-900: #172d51;
  --color-skies-of-cyberspace-950: #081a36;
}

SCSS

$skies-of-cyberspace: #4573c8;
$skies-of-cyberspace-rgb: 69, 115, 200;
$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);
}