A line chart tracks cumulative global COVID-19 deaths over time, using a black, five-pixel-wide path scaled to the full window. A horizontal marker at four million deaths and a vertical “now” marker at the latest date highlight key thresholds. The visualization is built with React components and D3 v7, using `scaleTime`, `scaleLinear`, and `line` for the path, plus `axisBottom` and `axisLeft` for gridlines. Data comes from a CSV of Johns Hopkins global death counts, aggregated by day and rendered as SVG.