set color of windows titlebar - electron.js

You must hide the window-title bar and build a new window title bar in html,css,js..

There's no way at the moment to customize the native titlebar. So, first step is to hide the native titlebar by telling your BrowserWindow to hide the frame (that would also hide the menubar).

mainWindow = new BrowserWindow({
    frame: false
})

see: https://electronjs.org/docs/api/browser-window

Then, you should create your custom titlebar (or import a third party library like 1 or 2) in HTML, CSS and JS. That way, the titlebar lives under the renderer process in Electron. So, to actually for example quit your application when clicking the X button, you should take advantage of the IPC to send an event to the main process and quit the application.

Example:

# renderer
ipcRenderer.send('app:quit')

# main
ipcMain.on('app:quit', () => { app.quit() })

Or as an alternative: look this answer here on StackOverflow

actually now there is a way
take a look here, a lot of electron apps use it so I think is a win win...
just make sure to install this first

npm i custom-electron-titlebar