#4370D5

CSS

:root {
  --skies-of-cyberspace: #4370d5;
  --skies-of-cyberspace-rgb: 67 112 213;
  --skies-of-cyberspace-oklch: oklch(0.566 0.163 263.9);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(222 63% 55%);
  border-color: oklch(0.566 0.163 263.9);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4370d5;
  --color-skies-of-cyberspace-50: #dff5ff;
  --color-skies-of-cyberspace-100: #cee8ff;
  --color-skies-of-cyberspace-200: #b3d3ff;
  --color-skies-of-cyberspace-300: #90b5ff;
  --color-skies-of-cyberspace-400: #6c9bfe;
  --color-skies-of-cyberspace-500: #4c7ff1;
  --color-skies-of-cyberspace-600: #416ccb;
  --color-skies-of-cyberspace-700: #3456a3;
  --color-skies-of-cyberspace-800: #21407a;
  --color-skies-of-cyberspace-900: #162c56;
  --color-skies-of-cyberspace-950: #07183a;
}

SCSS

$skies-of-cyberspace: #4370d5;
$skies-of-cyberspace-rgb: 67, 112, 213;
$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);
}