A dark-themed bar chart ranks smartphone brands by total units sold in millions. Summed via `d3.rollups` and sorted descending, each brand appears as a blue bar with value labels, using a band scale for categories and a linear scale for counts. The CSV is fetched from a GitHub Gist, parsed with `d3.csvParse` and `d3.autoType`, then rendered as SVG with gridlines and rotated axis labels generated through `d3.axisLeft` and `d3.axisBottom`.