This example is a minimal HTML page that displays a single circle centered in an SVG canvas rendered by the browser. It relies on the `d3.forceSimulation` API indirectly through a simplified fork, but the code itself only uses basic Scalable Vector Graphics (SVG) elements—a circle with no explicit position or fill—and inline CSS styles to hide page scrolling. The page is authored with plain HTML and JavaScript, with no external data source, and the rendering solely depends on the SVG geometry defined in `index.html`. It demonstrates the foundational structure of a D3 visualization.