This example shows a yellow smiley face centered in the browser window, scaling its size to fit the viewport. The face is composed of three SVG circles: a large yellow head with a black stroke, and two smaller black circles for eyes. Built with React, the code uses `ReactDOM.render` to inject the SVG directly into the page. Dimensions like window width and height are read dynamically, and all facial feature positions are calculated relative to the center point using SVG transforms. The rendering relies on React’s JSX syntax for SVG elements, with the `stroke-width` attribute set explicitly to 20.