Full width website

Hi, I had already added some code to my stylesheet a while ago that made the grey border around the edges of my website (www.travelintense.com) disappear and instead show a clean fullwidth website where the navigation bar is all in one line. However, I recently had some hosting trouble, and even though I did a back up and restored it, the code for my preferred appearance seems to have gone missing. Could you please let me know what to do get my wished for result again? Cheers!