LMS Width and Height Issues

We have recently upgraded our LMS to be fully responsive .  However, the issue that I am having is the LMS provider has mentioned our module iFrame is set to specific width and height.

Now the problem with that, is that if the iFrame sets those dimensions, the content will not resize correctly when the browser size is changed.  This would also apply to phone and tablet devices.

The LMS provider has stated that we need to ensure our files are not set to specific dimensions, but rather set to fit at 100% of whatever the container is they lie in.

My question is... how do we do that?!  I'm using Lectora v16.  Even when I loaded a Responsive Title to the LMS, it still was not fully responsive and the iFrame has specific height and width.

Thank you in advance.