This example displays a full-page message reading “Hello HTML!” at a very large font size, centered on the screen. It is a minimal demonstration of basic HTML structure combined with CSS styling and JavaScript inclusion, built using the React framework. The code defines a single `<div>` element with a CSS class that sets the font-size to 13em and text-align to center, while the page itself relies on no external libraries or data sources. It serves as a starting point for exploring how React integrates with plain HTML and CSS in a visualization context.