This multi-line chart shows cumulative COVID-19 deaths over time for each country, with all countries plotted using semi-transparent gray lines. A Voronoi overlay enables hover interaction, highlighting the nearest data point’s country and displaying a tooltip with its name, death total, and date. Built with React and D3 v5, the visualization uses `d3.scaleLog` for the y-axis, `d3.scaleTime` for the x-axis, and `d3.Delaunay` from the `d3-delaunay` library to construct the Voronoi cells for efficient hit-testing. Data comes from the Johns Hopkins Coronavirus dataset.