Shapes and Colors with SVG and CSS
A minimal SVG scene drawn with D3 v5 renders a single circle centered within a 960-by-500 viewport. The code uses `svg.append('circle')` and sets `r`, `cx`, and `cy` attributes based on the SVG’s width and height, while an external stylesheet removes page margins and hides overflow. The circle fills half the vertical space, demonstrating basic shape creation and attribute binding without data or interaction.