#4270D8

CSS

:root {
  --skies-of-cyberspace: #4270d8;
  --skies-of-cyberspace-rgb: 66 112 216;
  --skies-of-cyberspace-oklch: oklch(0.568 0.167 263.9);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(222 66% 55%);
  border-color: oklch(0.568 0.167 263.9);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4270d8;
  --color-skies-of-cyberspace-50: #dff5ff;
  --color-skies-of-cyberspace-100: #cee7ff;
  --color-skies-of-cyberspace-200: #b3d3ff;
  --color-skies-of-cyberspace-300: #8fb4ff;
  --color-skies-of-cyberspace-400: #6b9aff;
  --color-skies-of-cyberspace-500: #4b7ef3;
  --color-skies-of-cyberspace-600: #406bcd;
  --color-skies-of-cyberspace-700: #3356a5;
  --color-skies-of-cyberspace-800: #203f7b;
  --color-skies-of-cyberspace-900: #152c57;
  --color-skies-of-cyberspace-950: #07183b;
}

SCSS

$skies-of-cyberspace: #4270d8;
$skies-of-cyberspace-rgb: 66, 112, 216;
$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);
}