The slides should show up here. If they don't, it might be because you are accessing this file directly from your filesystem. It needs to be served from a web server. You can try this:

        docker-compose up -d
        open http://localhost:8888/workshop.html # on MacOS
        xdg-open http://localhost:8888/workshop.html # on Linux
      

Once the slides are loaded, this notice disappears when you go full screen (e.g. by hitting "f").