This example displays a single red rectangle on an SVG canvas. The rectangle is defined with inline attributes and CSS styles that apply a border and fill color. Interactive behavior is included: hovering over the shape triggers a CSS transition, gradually changing its fill to green and expanding its stroke width over three seconds. The code uses plain HTML, CSS, and SVG, with no external libraries. The rendering relies on the SVG `rect` element and CSS `:hover` and `transition` properties.