Royal Slider full screen issue

I would really appreciate some help on getting the slider work responsively in full screen.
Here’s the issue I posted on the Slider’s support forum. Unfortunately support there is pretty bad. I asked 2 guys who were pretty good in CSS to help me and none of they were able to do anything,after spending a few hours trying to make it work

http://help.dimsemenov.com/discussions/royalslider-wordpress/34834-making-a-full-screen-gallery-with-200-images

Where do I put all the code? I tried style css and it didn’t do anything. broke all the functions of the slider…