A stark, minimal line chart presents a single black polyline with rounded endpoints, shaped by a series of coordinates against a blank background. The visualization overlays a rounded rectangle as a canvas backdrop, dynamically scaling the SVG to fit the full browser viewport. The chart relies on D3's `select` to manage the SVG element, while the path itself is defined directly in HTML markup, with no data-driven generation or interactive behavior. The rendering leverages the SVG `path` element and CSS to control the stroke width, linecap, and join styles.