This example presents a simple SVG circle rendered on a blank HTML page, demonstrating how to combine CSS and JavaScript in a minimal web document. The page uses a single `<svg>` element with a `<circle>` whose radius is set to 400 pixels, while the CSS centers the body text at a very large font size. The code relies on native HTML, CSS, and SVG markup, with no external libraries or JavaScript functions beyond the inline style and element structure. The visualization is static and primarily showcases how SVG shapes can be embedded directly in an HTML file.