This pie chart visualizes the percentage distribution of the top five countries with the most coronavirus cases. The data is loaded from a CSV file hosted on GitHub Gist. Built with D3.js v5, the visualization uses `d3.pie` to compute arc segments, `d3.arc` to generate the sector paths, and `d3.scaleOrdinal` for color mapping. Each sector is labeled with its percentage, and a legend displays the country names and corresponding values. The SVG canvas is 960 by 460 pixels, with the chart centered and styled via external CSS.