This example demonstrates overlapping semi-transparent rectangles in a 500-by-500 SVG canvas, using CSS rgba values to create blended color regions. The visualization is rendered entirely with inline SVG elements, and the page includes a large styled message text via D3's `select` function. Index.js imports D3 and a local ES6 module to set the text content, while styles.css applies a dark background and Ubuntu font. The code shows basic SVG shapes without interaction or data binding, highlighting fundamental SVG rendering and module imports.