:root {
  /*
   * Preview-only controls. These do not change tracking coordinates.
   * -1 makes the selfie preview behave like a mirror; use 1 for a raw camera.
   */
  --camera-preview-mirror-x: -1;

  /* Increase to focus more tightly on the person without changing motion gain. */
  --camera-preview-zoom: 1.45;
}