This example demonstrates basic geometric shapes drawn with SVG, including lines and paths, styled through an external CSS file. The visualization is built using D3 version 5 to select and manipulate the SVG container, while the rendering relies on native SVG elements and CSS properties for stroke color, width, line joins, and caps. The CSS classes, such as `.lines`, apply styling to path elements within the SVG, resulting in round-cornered, dark teal strokes. The code shows how D3 and SVG can be combined for simple vector graphics without a dataset.