A white circle is centered on a crimson background, forming a simple face-like base. The example uses D3.js v5 with SVG rendering, importing `select` and `arc` from the library, though only `select` is applied to append the circle element. The circle’s radius and position are derived from the SVG’s width and height attributes, which are read dynamically. The code sets the background color via inline style and constructs the shape declaratively without data binding or interaction.