This example demonstrates a minimal SVG canvas that initially appears blank but responds to user interaction by adjusting a large, centered "Hello!" message through hot reloading. The code sets up an SVG element sized 960 by 500 pixels and uses d3.v7 from a CDN, though the main rendering relies on plain container.innerHTML with inline CSS styles. The JavaScript exports a main function that receives the container and writes the text with a configurable font-size property, while a separate stylesheet applies default margins, hidden overflow, and styled path strokes. The visualization highlights fundamental SVG and CSS usage without complex data binding.