<!DOCTYPE html>
<html>

<body>
  <h1>Welcome to Matrixread.com</h1>
  <p>The background appears dark if you prefer dark mode white/normal otherwise.</p>
</body>

</html>
body
{
  font-family:Arial;
}
@media (prefers-color-scheme: dark) {
  body,
  a {
    background-color: #121212;
    color: white;
  }
}

External CSS

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External JavaScript

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