This example demonstrates how SVG shapes—circles, rectangles, lines, and paths—can be styled and transformed using both inline attributes and CSS rules. It shows default black shapes, shapes with explicit `fill` colors, a group with a cyan fill and black stroke, and a separate group of lines and paths styled via CSS classes. The rendering uses SVG elements placed in an HTML page, with the `styles.css` file providing stroke width, color, and line-join properties for the `.lines` class and its path child.