This example shows a single gray circle centered on an SVG canvas, demonstrating the simplest possible static data visualization with no data or interaction. The circle is rendered using an SVG `circle` element with a fixed radius of 100 pixels, positioned by default at the top-left corner of the viewport. The code uses inline HTML and CSS within an `index.html` file, with no external JavaScript libraries or frameworks. The React starter template is referenced in the README but is not implemented in the visible source.