#2F6FE3

CSS

:root {
  --skies-of-cyberspace: #2f6fe3;
  --skies-of-cyberspace-rgb: 47 111 227;
  --skies-of-cyberspace-oklch: oklch(0.567 0.189 261.1);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(219 76% 54%);
  border-color: oklch(0.567 0.189 261.1);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #2f6fe3;
  --color-skies-of-cyberspace-50: #d9f6ff;
  --color-skies-of-cyberspace-100: #c7e8ff;
  --color-skies-of-cyberspace-200: #aad4ff;
  --color-skies-of-cyberspace-300: #84b5ff;
  --color-skies-of-cyberspace-400: #5b9bff;
  --color-skies-of-cyberspace-500: #367eff;
  --color-skies-of-cyberspace-600: #2f6bd8;
  --color-skies-of-cyberspace-700: #2556ae;
  --color-skies-of-cyberspace-800: #133f82;
  --color-skies-of-cyberspace-900: #0c2c5c;
  --color-skies-of-cyberspace-950: #02183f;
}

SCSS

$skies-of-cyberspace: #2f6fe3;
$skies-of-cyberspace-rgb: 47, 111, 227;
$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);
}