This example demonstrates a smiley face rendered as a scalable vector graphic, with a yellow circle for the head and black circles for the eyes, positioned relative to the viewport's center. The React application uses the `react` and `react-dom` libraries to inject an `<svg>` element into the page, calculating dimensions from `window.innerWidth` and `window.innerHeight`. The face is composed of a main circle and two eye circles, all drawn using SVG's `<circle>` elements, with the head's radius based on the available height. The code is a JavaScript file that defines the component and renders it to the root element.