This example displays a grid of small, green rounded squares that fill the browser window. The page uses plain JavaScript to create and append 50 div elements to the document body via a `for` loop, relying on the DOM API `document.createElement` and `document.body.append`. Each square has a fixed 84-pixel size and margin, positioned automatically with CSS flexbox wrapping. The visual result is a simple, uniform pattern of tiles without any interactive behavior or data-driven logic.