This example displays a large, centered “Hello HTML!” message using basic CSS styling. The page consists of an HTML document that applies a 13-em font size and text alignment through a `.message` class defined in a `<style>` block. It demonstrates the fundamental structure of an HTML page with embedded CSS, without any JavaScript logic or external libraries. The rendering relies purely on the browser’s default HTML and CSS processing, showing how a static text element can be visually emphasized.