Part 3 - Scales the post node in render according to dragProgress

Post.js

render() {
  /* same code */
  
  const { dragProgress } = this.state;

  const postStyle =
    dragProgress > 0
      ? {
          transform: `scale(${1 - dragProgress * (1 - DRAG_MINIMUM_SCALE)})`,
          borderRadius: dragProgress * 16
        }
      : null;
  
  // we need to set the style to null otherwise transform: scale(0)
  // will make the close icon lose its fixed positioning and scroll
  // with the post.
  
  // read https://stackoverflow.com/a/42660333 for more info
  
  return (
    <CSSTransition /* ...props */ />
    <div className="page full-width page-post">
      <div
        ref={post => (this.post = post)}
        className="post full-width"
        style={postStyle}
      >
    /* same code */
  );
}