Yeah it looks good to me in Firefox, Chrome, and IE9. However if you are trying to center align the text, Philip's answer above me will do just fine. Add that to the body selector in your CSS. If you are trying to center align your content box, add this to your content box css:
that will auto align your left and right sides, centering your content to the middle. The 0 in front of "auto" is for the top and bottom margins, you can change this if you would like.