This example demonstrates a minimal D3 setup that changes the entire page background to red. The code imports the `select` function from D3 and applies a `style` method to the body element, modifying its `background-color`. The project relies on D3 version 7.8.2, loaded via a CDN, and includes a bundled JavaScript file. It serves as a basic starting point for understanding how D3 manipulates the DOM, with the HTML page containing oversized text to emphasize the effect.