A yellow circle with a thick black outline is rendered near the center of an SVG canvas, with no facial features yet, representing the first step toward building a smiley face. The React component `App` returns the SVG markup using JSX, and `ReactDom.render` mounts it to the `#root` element. The circle uses hard-coded `cx`, `cy`, `r`, and `stroke-width` values, with an inline style setting the page margin to zero and hiding overflow. The example demonstrates basic React rendering of static SVG shapes without any data or interactivity.