This example demonstrates a simple interactive SVG graphic: a single red rectangle with a thick black border that transitions smoothly to a green fill and an even thicker border when hovered. It uses CSS transitions applied directly to SVG `rect` elements, triggered by the `:hover` pseudo-class. The rendering is static SVG within an HTML document, with the transition duration set to 2000 milliseconds. The code relies on native browser CSS support rather than JavaScript libraries, showcasing how SVG styling and animation can be handled purely through stylesheet rules.