This example uses SVG and CSS to draw a single static shape: a yellow circle with a black outline, centered within a 960 by 500 pixel canvas. The underlying JavaScript, built with d3.v7, leverages the `select` and `append` methods from the d3 library to programmatically create the circle. The circle’s radius is set to half the SVG’s height, and its horizontal and vertical positions are calculated from the SVG’s width and height attributes, which are read and converted using `parseFloat`. Styling is applied via the `attr` method for fill color and stroke, resulting in a simple geometric visualization.