#4570D6

CSS

:root {
  --skies-of-cyberspace: #4570d6;
  --skies-of-cyberspace-rgb: 69 112 214;
  --skies-of-cyberspace-oklch: oklch(0.568 0.164 264.6);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(222 64% 55%);
  border-color: oklch(0.568 0.164 264.6);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4570d6;
  --color-skies-of-cyberspace-50: #e0f5ff;
  --color-skies-of-cyberspace-100: #cfe7ff;
  --color-skies-of-cyberspace-200: #b4d3ff;
  --color-skies-of-cyberspace-300: #91b4ff;
  --color-skies-of-cyberspace-400: #6d9aff;
  --color-skies-of-cyberspace-500: #4e7ef1;
  --color-skies-of-cyberspace-600: #436bcb;
  --color-skies-of-cyberspace-700: #3556a4;
  --color-skies-of-cyberspace-800: #223f7a;
  --color-skies-of-cyberspace-900: #162c56;
  --color-skies-of-cyberspace-950: #08183a;
}

SCSS

$skies-of-cyberspace: #4570d6;
$skies-of-cyberspace-rgb: 69, 112, 214;
$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);
}