Content is too far to the left

Hello. I'm a beginner using wordpress and I've recently installed Simple Catch on my website My Parallel Musicverse So far I think it looks very nice, But people have told me that the content looks too far to the left, at the point that on some cell phones they can't even see the first letters. Here is an example of it: My guess is that it has something to do with the MARGINS but I really don't know. I would like to move everything just a little to the center. I've done some research and found out that maybe I can do it editing the CSS style, but as I'm a complete beginner I really don't want to mess up anything. And I haven't found info on the specific problem I have. So I'd really appreciate any help!. Thanks in Advane. Germán Toledo C.