Jupyter Notebook BG Changer

notebookの背景色を切り替えます．複数のサーバーのnotebookに繋ぐときに，どのサーバーに繋いでいるかがわかりやすく，操作ミスを防ぐことができます． notebook color the this connecting to notebookのポートに応じて，jupyter extension you when connecting jupyter prevent multiple you errors. background number. server operation of according switches to are jupyter know can port to which and servers,