#316FE2

CSS

:root {
  --skies-of-cyberspace: #316fe2;
  --skies-of-cyberspace-rgb: 49 111 226;
  --skies-of-cyberspace-oklch: oklch(0.567 0.187 261.4);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(219 75% 54%);
  border-color: oklch(0.567 0.187 261.4);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #316fe2;
  --color-skies-of-cyberspace-50: #daf6ff;
  --color-skies-of-cyberspace-100: #c8e8ff;
  --color-skies-of-cyberspace-200: #abd4ff;
  --color-skies-of-cyberspace-300: #85b5ff;
  --color-skies-of-cyberspace-400: #5d9aff;
  --color-skies-of-cyberspace-500: #387eff;
  --color-skies-of-cyberspace-600: #316bd7;
  --color-skies-of-cyberspace-700: #2656ad;
  --color-skies-of-cyberspace-800: #153f81;
  --color-skies-of-cyberspace-900: #0d2c5c;
  --color-skies-of-cyberspace-950: #02183e;
}

SCSS

$skies-of-cyberspace: #316fe2;
$skies-of-cyberspace-rgb: 49, 111, 226;
$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);
}