This example demonstrates a simple loading indicator, a purely visual element that signals an ongoing process through a spinning animation. It shows a circular progress icon that rotates continuously to convey activity. The visualization is achieved using a single HTML `div` element with a CSS class, styled through the provided stylesheet. The core logic relies on the CSS `animation` property with a `@keyframes` rule named `spin`, which rotates the element from 0 to 360 degrees over a two-second linear infinite cycle. The loader’s design uses a bordered circle with a transparent center and a contrasting top border to create the spinning effect, while the container is positioned absolutely with a high z-index and partial opacity.