This example shows three nested circles centered at the same point, each with a distinct solid color: green, yellow, and blue. The circles are drawn directly in an SVG element with a fixed width and height of 4000 pixels, using static `circle` elements with explicit `cx`, `cy`, and `r` attributes. The page relies on plain HTML and CSS for layout, with the `message` class defining font styling that is not used in the visible output. No JavaScript libraries or dynamic data are involved.