#4175CE

CSS

:root {
  --skies-of-cyberspace: #4175ce;
  --skies-of-cyberspace-rgb: 65 117 206;
  --skies-of-cyberspace-oklch: oklch(0.571 0.148 260.4);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(218 59% 53%);
  border-color: oklch(0.571 0.148 260.4);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #4175ce;
  --color-skies-of-cyberspace-50: #dff6ff;
  --color-skies-of-cyberspace-100: #cee9ff;
  --color-skies-of-cyberspace-200: #b2d5ff;
  --color-skies-of-cyberspace-300: #8eb7ff;
  --color-skies-of-cyberspace-400: #6a9ef5;
  --color-skies-of-cyberspace-500: #4883e7;
  --color-skies-of-cyberspace-600: #3e6fc3;
  --color-skies-of-cyberspace-700: #31599d;
  --color-skies-of-cyberspace-800: #1f4175;
  --color-skies-of-cyberspace-900: #152d52;
  --color-skies-of-cyberspace-950: #061a37;
}

SCSS

$skies-of-cyberspace: #4175ce;
$skies-of-cyberspace-rgb: 65, 117, 206;
$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);
}