Broken UI Upfront Scribe, no settings cog

Hi

I seem to have corrupted something in my CSS efforts again. I was experimenting with different position types for images so I could get the mobile responsive version to work better and something went badly wrong, now I do not see my images in editor (they only briefly flash when I move them) and the settings cog has disappeared. I installed Scribe on a different site and with FTP grabbed the two stylesheets (image_default and logo-with-seperator) which I had last edited and moved these into the corrupted one but it doesn't seem to have helped. Please help and let me know what has gone wrong so I don't repeat the error. Thanks