This example demonstrates a simple collection of SVG shapes, including a green circle, a blue-outlined circle with a red rectangle, and a polyline path with a yellow fill. The shapes are rendered using raw SVG elements within an HTML page, with styling and stroke properties applied through an external CSS stylesheet, including a `.lines` class that controls stroke color and width. The code uses no JavaScript libraries, relying solely on SVG tags like `<circle>`, `<rect>`, `<line>`, and `<path>`, along with CSS for presentation.