Changing the margin of the main content

Hi guys, I've looked everywhere but I haven't been able to find the css coding for what I'm trying to do. I want to move the main content (ie. posts) slightly more to the left-hand side. Not sure if that's a margin, border or padding issue. (Goal is to have as much of the text as possible on the pink part of the background) http://alladventurousdo.com/ Thanks!