Can we increase the iframe size?

In Storyline 360, we added link of our web app in web object (selecting to display within the slide). However, the web apps appear quite small in the iframe. 

App developers investigated the issue and explained that Javascript code is missing that would allow the app to be responsive. "Without the Javascript, the UI is too small for the frame."

What could be the workaround? How can we execute JS? Should it be for player?

I referred to the following links : Storyline 360: JavaScript Best Practices and Examples - Articulate Support

https://community.articulate.com/discussions/articulate-storyline/insert-iframe-content-into-storyline-360

However, nothing working for me. I increased the frame size (height and width), but it's not doing anything great. Please suggest how we can fix this