This chart displays monthly expenses as a magenta line and semi-transparent area over a blue-tinted time series, with red axis labels. The visualization uses D3 v5 to load CSV data from a GitHub gist, parse dates, and render an SVG with a time-scaled X-axis and linear Y-axis. Gridlines are added via axis ticks, and the smooth curve is generated using `curveBasis` within D3’s `line()` and `area()` generators.