This example demonstrates how SVGs can be styled using CSS classes and inline attributes within a React framework. The visualization renders circles, rectangles, lines, and paths, employing D3 v5 for the SVG structure while leveraging CSS to define stroke properties and line joins. The `lines` class applies black strokes with a width of 10, while the path element inherits a teal stroke and rounded line joins, showcasing the interplay between SVG geometry and CSS styling.