A line chart tracks global cumulative COVID-19 deaths over time, using a black path for the trend and gray gridlines. A horizontal marker highlights the 5 million death milestone, while a vertical marker at the most recent date labels the final data point. The visualization is built with React and D3 v5, using `scaleTime`, `scaleLinear`, and `line` to map the data from a CSSE time-series CSV, rendered as SVG.