Change Jupyter (Not JupyterLab) Terminal Background Colour and Foreground Colour

Jupyter (Classic), not the new JupyterLab has black background terminal. The terminal is a canvas and stuff are drawn inside, CSS won't work. To change the terminal:

1) Install Tampermonkey for browser

2) Go to OpenUserJS.org and create account

3) Add this script:
// ==UserScript==
// @name     localhost:8888
// @include  http://localhost:8888/*
// @run-at   document-start
// @license  MIT
// ==/UserScript==

setTimeout(()=>{
  terminal.term.setOption(
    "theme",
    {background:"#bbbbbb",foreground:"black"}
  );
},3000);
//EOF

Public Tampermonkey script:
https://openuserjs.org/scripts/datdinhquoc/localhost8888