#2D6FE4

CSS

:root {
  --skies-of-cyberspace: #2d6fe4;
  --skies-of-cyberspace-rgb: 45 111 228;
  --skies-of-cyberspace-oklch: oklch(0.567 0.19 260.9);
}

.element {
  color: var(--skies-of-cyberspace);
  background-color: hsl(218 77% 54%);
  border-color: oklch(0.567 0.19 260.9);
}

Tailwind CSS v4

@theme {
  --color-skies-of-cyberspace: #2d6fe4;
  --color-skies-of-cyberspace-50: #d9f6ff;
  --color-skies-of-cyberspace-100: #c6e8ff;
  --color-skies-of-cyberspace-200: #a9d4ff;
  --color-skies-of-cyberspace-300: #83b5ff;
  --color-skies-of-cyberspace-400: #5a9bff;
  --color-skies-of-cyberspace-500: #337eff;
  --color-skies-of-cyberspace-600: #2d6bd9;
  --color-skies-of-cyberspace-700: #2356af;
  --color-skies-of-cyberspace-800: #123f83;
  --color-skies-of-cyberspace-900: #0b2c5c;
  --color-skies-of-cyberspace-950: #01183f;
}

SCSS

$skies-of-cyberspace: #2d6fe4;
$skies-of-cyberspace-rgb: 45, 111, 228;
$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);
}