This example demonstrates a minimal interactive web page that uses CSS for styling and JavaScript for behavior, rendering the message “Hello HTML!” centered on the screen. The single `index.html` file defines a div with the class `message`, whose font size and text alignment are set via a CSS rule. No external libraries are used; the page relies solely on plain HTML, CSS, and JavaScript, serving as a bare-bones starter template for building more complex visualizations. The code does not include data fetching or chart rendering.