This example displays a grid of 100 circular blue elements that turn red on hover, demonstrating how CSS styling and JavaScript interact to create interactive visuals. The code uses vanilla JavaScript with the Document Object Model (DOM) API, specifically `document.createElement` and `document.body.append`, to generate the circles dynamically. Styling relies on CSS flexbox for layout, `border-radius` for round shapes, and the `:hover` pseudo-class to change background color. The visualization shows a simple, responsive pattern where each circle responds independently to user interaction, illustrating basic DOM manipulation and event-driven styling without external libraries.