I am not sure but are you confusing me with another question?
We are aware that, as with many themes, you can add additional css.
I thought the theme was responsive? But it is not behaving like that at all. The images are too large on smaller screens and everything even the buttons are not behaving like responsive in the Hero slider. That should not happen if it was responsive.
Your @media statements in your css file are being overruled, and not by ours since we have checked that. However we cannot find for the live of it from what.