#3071DB

CSS

:root {
  --skies-of-cyberspace: #3071db;
  --skies-of-cyberspace-rgb: 48 113 219;
  --skies-of-cyberspace-oklch: oklch(0.565 0.176 259.8);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(217 70% 52%);
  border-color: oklch(0.565 0.176 259.8);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #3071db;
  --color-skies-of-cyberspace-50: #daf6ff;
  --color-skies-of-cyberspace-100: #c8e9ff;
  --color-skies-of-cyberspace-200: #abd5ff;
  --color-skies-of-cyberspace-300: #85b6ff;
  --color-skies-of-cyberspace-400: #5d9cff;
  --color-skies-of-cyberspace-500: #3780f8;
  --color-skies-of-cyberspace-600: #306dd1;
  --color-skies-of-cyberspace-700: #2657a8;
  --color-skies-of-cyberspace-800: #15407e;
  --color-skies-of-cyberspace-900: #0d2d59;
  --color-skies-of-cyberspace-950: #02193c;
}

SCSS

$skies-of-cyberspace: #3071db;
$skies-of-cyberspace-rgb: 48, 113, 219;
$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);
}