This example shows a single gray circle centered in an SVG canvas, with no interactive behavior beyond its static position. The circle is rendered using React’s JSX syntax inside an `<svg>` element, with dimensions fixed at 960 by 500 pixels. The code imports React and ReactDOM to mount the component, and loads D3 v5 as a dependency, though it does not use any D3 functions. The rendering approach relies on declarative React state and SVG primitives, with the circle’s center coordinates and radius defined as constants.