A stacked bar chart displays monthly sales data from a CSV file, showing both quantity and amount per month in two color-coded segments. The visualization uses D3.js with SVG rendering, loading data via `d3.csv` from a GitHub gist. The chart leverages `d3.scaleBand` for the categorical month axis, `d3.scaleLinear` for the numeric amount axis, and `d3.scaleOrdinal` for color assignment. It includes manually positioned axis labels, a title, and a legend built with SVG rectangles and text. The styling uses custom fonts and colors defined in a separate CSS file.