A full-window, rounded rectangle fills the browser viewport as a blank canvas, rendered as a static SVG shape. The visualization demonstrates a minimalist setup using D3 v5’s `select` to target the SVG element and set its width and height attributes based on the document’s client dimensions. A single `rect` is appended with a large corner radius (`rx` of 40), and CSS fixes the body to eliminate scrolling. No data or interactive behavior is present; the piece simply showcases a clean, borderless visual starting point.