Awesome! thanks for help.
require('electron').remote.getCurrentWindow().setAlwaysOnTop(true);
require('electron').remote.getCurrentWindow().setOpacity(0.88);
In short, running the code snippet below will make the window sticky and translucent (change 0.88 to play with opacity)
let getWindow = require('electron').remote.getCurrentWindow();
getWindow.setOpacity(0.88);
getWindow.setAlwaysOnTop(true);