#2970E2

CSS

:root {
  --skies-of-cyberspace: #2970e2;
  --skies-of-cyberspace-rgb: 41 112 226;
  --skies-of-cyberspace-oklch: oklch(0.566 0.188 259.8);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(217 76% 52%);
  border-color: oklch(0.566 0.188 259.8);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #2970e2;
  --color-skies-of-cyberspace-50: #d8f6ff;
  --color-skies-of-cyberspace-100: #c6e9ff;
  --color-skies-of-cyberspace-200: #a8d4ff;
  --color-skies-of-cyberspace-300: #81b6ff;
  --color-skies-of-cyberspace-400: #579cff;
  --color-skies-of-cyberspace-500: #2f7fff;
  --color-skies-of-cyberspace-600: #296cd7;
  --color-skies-of-cyberspace-700: #2156ad;
  --color-skies-of-cyberspace-800: #0f4081;
  --color-skies-of-cyberspace-900: #0a2c5c;
  --color-skies-of-cyberspace-950: #00183e;
}

SCSS

$skies-of-cyberspace: #2970e2;
$skies-of-cyberspace-rgb: 41, 112, 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);
}