This example renders a static HTML page that displays a large, centered message reading “Hello HTML!” using CSS for styling. The code defines a `message` class with a font size of 13 em and text alignment, applied to a single `div` element. It does not include any interactive visualization, data loading, or JavaScript logic beyond the basic HTML structure, nor does it reference React or any specific data-visualization libraries. The page is a minimal demonstration of CSS and HTML, not a family tree or chart.