How to make the Viewer UI compatible with mobile screen resolution

I have forked the latest ohif viewer , and right now running it locally to continue my testing of this application , there is one thing i need help regarding , and that is where to implement the css styling to make the viewer comptable with mobile viewing ?

right now when we are trying to view the study in mobile , then currently the UI is not designed to adapt to the mobile screen resolution and the user is not having good experience in this regard , so to make the UI comptable with mobile screen resolution , i want to implement the css styling ,

So help me out where exactly i will have to implement this styling ?