Jupyter Notebook BG Changer

This extension switches background color of Jupyter Notebook according to the port number. When connecting to multiple servers, you can know which server you are connecting to and prevent operation errors.
Jupyter Notebookのポートに応じて，Jupyter 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．