This responsive line chart displays revenue trends over time, with expenses on the x-axis and revenue on the y-axis, plotted as a single blue line. The chart is built using the D3.js v7 library, which fetches CSV data from a GitHub Gist via `d3.csv`, scales the axes with `scaleLinear`, and renders the line as an SVG path using `d3.line` and `axisBottom`/`axisLeft` for the axes.