This example demonstrates how SVG shapes—circles, rectangles, lines, and paths—can be styled and grouped using both inline attributes and an external CSS stylesheet. The first two shapes use default black fills, while later shapes apply explicit fills like red and a green hex code, and a group-level fill with a black stroke. CSS class `.lines` sets stroke color and width, with a nested rule for path line joins. The rendering uses raw SVG in an HTML file, with a scale transform and translated groups.