scene, this.camera);
  window.requestAnimationFrame(() => this.render());
}
            </code></pre>
          </section>
          <section>
            <iframe width="100%" height="600" data-src="/ch4.html">
            </iframe>
          </section>




          <!-- 5. Adding the car -->
          <section>
            <h1>Adding the car</h1>
          </section>
          <section>
            <h2>SCSS</h2>
            <pre><code>
car {
  @extend %pseudo-block;
  border: 1px solid green;
  width: 70p