This area chart visualizes the distribution of student marks, showing the number of students across different score ranges on the x-axis and y-axis. The chart uses a linear gradient fill that fades from a semi-transparent purple at the bottom to fully transparent at the top, creating a smooth shaded area beneath the curve. The visualization is rendered as an SVG using D3 v7, with scales defined via `d3.scaleLinear` and the area shape generated by `d3.area`. The dataset is loaded asynchronously from a GitHub gist CSV file using `d3.csv`.