This visualization displays the cumulative number of COVID-19 deaths over time for each country, with a Voronoi overlay enabling interactive highlighting. A log-scaled y-axis and time-scaled x-axis render the line chart, while the D3 Delaunay triangulation (`d3.Delaunay`) and Voronoi diagram compute proximity regions for each data point. Hovering a cell triggers a React state update, redrawing a country's line in bold black. Data is sourced from the Johns Hopkins CSSE COVID-19 dataset, rendered as SVG.