Stylized Bar Chart
This stylized bar chart displays the top 10 most populous countries using data from the United Nations World Population Prospects 2019. Horizontal bars are rendered as SVG rectangles, with a Poppins font and muted teal and gray styling. The visualization leverages React for component structure and d3.scaleBand and d3.scaleLinear for scaling, while d3.csv loads the dataset. Tooltips appear via SVG `<title>` elements, and axis labels use d3.format to convert values into billions.