#3E75D0

CSS

:root {
  --skies-of-cyberspace: #3e75d0;
  --skies-of-cyberspace-rgb: 62 117 208;
  --skies-of-cyberspace-oklch: oklch(0.571 0.152 259.9);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(217 61% 53%);
  border-color: oklch(0.571 0.152 259.9);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #3e75d0;
  --color-skies-of-cyberspace-50: #def6ff;
  --color-skies-of-cyberspace-100: #cce9ff;
  --color-skies-of-cyberspace-200: #b1d5ff;
  --color-skies-of-cyberspace-300: #8cb7ff;
  --color-skies-of-cyberspace-400: #679ef7;
  --color-skies-of-cyberspace-500: #4583e9;
  --color-skies-of-cyberspace-600: #3b6fc5;
  --color-skies-of-cyberspace-700: #2f599e;
  --color-skies-of-cyberspace-800: #1d4176;
  --color-skies-of-cyberspace-900: #132d53;
  --color-skies-of-cyberspace-950: #051a38;
}

SCSS

$skies-of-cyberspace: #3e75d0;
$skies-of-cyberspace-rgb: 62, 117, 208;
$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);
}