Electron Fiddle Gist

index.html

<!-- this is the important part: -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootswatch/4.4.1/darkly/bootstrap.min.css" media="(prefers-color-scheme: dark)">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootswatch/4.4.1/flatly/bootstrap.min.css" media="(prefers-color-scheme: no-preference), (prefers-color-scheme: light)">

<div class="row px-5">
  <div class="col-md-6">
    <h3 class="mt-5">Table with colors</h3>
    <p><strong>Note: </strong> Use <code>table-*</code> classes.</p>
    <table class="table table-hover">
      <thead>
        <tr>
          <th>Type</th>
          <th>Column heading</th>
          <th>Column heading</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <th scope="row">Default</th>
          <td>Column content</td>
          <td>Column content</td>
        </tr>
          <tr class="table-active">
            <th scope="row">Active</th>
            <td>Column content</td>
            <td>Column content</td>
          </tr>
          <tr class="table-primary">
            <th scope="row">Primary</th>
            <td>Column content</td>
            <td>Column content</td>
          </tr>
          <tr class="table-secondary">
            <th scope="row">Secondary</th>
            <td>Column content</td>
            <td>Column content</td>
          </tr>
          <tr class="table-success">
            <th scope="row">Success</th>
            <td>Column content</td>
            <td>Column content</td>
          </tr>
          <tr class="table-danger">
            <th scope="row">Danger</th>
            <td>Column content</td>
            <td>Column content</td>
          </tr>
          <tr class="table-warning">
            <th scope="row">Warning</th>
            <td>Column content</td>
            <td>Column content</td>
          </tr>
          <tr class="table-info">
            <th scope="row">Info</th>
            <td>Column content</td>
            <td>Column content</td>
          </tr>
          <tr class="table-light">
            <th scope="row">Light</th>
            <td>Column content</td>
            <td>Column content</td>
          </tr>
          <tr class="table-dark">
            <th scope="row">Dark</th>
            <td>Column content</td>
            <td>Column content</td>
          </tr>
      </tbody>
    </table>
  </div>

main.js

// Modules to control application life and create native browser window
const {app, BrowserWindow} = require('electron')

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow

function createWindow () {
  // Create the browser window.
  mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      nodeIntegration: true
    }
  })

  // and load the index.html of the app.
  mainWindow.loadFile('index.html')

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()

  // Emitted when the window is closed.
  mainWindow.on('closed', function () {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null
  })
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow)

// Quit when all windows are closed.
app.on('window-all-closed', function () {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

app.on('activate', function () {
  // On OS X it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (mainWindow === null) {
    createWindow()
  }
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.

renderer.js

// This file is required by the index.html file and will
// be executed in the renderer process for that window.
// All of the Node.js APIs are available in this process.