This pie chart visualizes total sales by region, with each slice labeled and a color-coded legend. It loads CSV data from a GitHub repository, aggregates sales per region, and renders an SVG using D3 v6 APIs such as `d3.pie`, `d3.arc`, and `d3.scaleOrdinal` with the Tableau 10 color scheme. The chart fills the browser window and includes hover effects for interactivity.