This example demonstrates basic SVG shape rendering alongside CSS styling in a simple web page. It shows three geometric shapes—two circles and a rectangle—positioned on a 960 by 500 canvas using inline SVG markup. The first circle and rectangle have no explicit fill, relying on default black rendering, while the second circle is explicitly filled red. The code uses standard HTML5, SVG elements like `circle` and `rect`, and a linked external stylesheet that sets the body margin and overflow properties. No JavaScript libraries or data sources are involved, highlighting raw SVG and CSS techniques.