I think this method should be deprecated. Having js and css files on local is better for security and reliability.
But even if this is something the developer don't want to do, at least a simpler change should be done: change the width of the whole app <div>, setting it to 90% and not to fixed value. This should make the app fairly responsive. Not perfect, but good enough.
Please? :D Otherwise it's useless in this responsive times.