A customized line chart visualizes the daily total COVID-19 cases in Virginia during 2020, with a smooth natural curve connecting the data points. The React application uses d3.v5's `scaleTime`, `scaleLinear`, `line`, and `curveNatural` to render the SVG path, with custom axis components for the bottom and left ticks. Data is loaded from a CSV file via `csv()` and mapped to dates and case counts. The chart displays the trend of cumulative cases over the year, with a five-pixel-wide teal stroke for the line.