For example:
* The text is wider than the screen and the scrolling destroys the readability of the text. Even when it would fit the screen, it makes a terrible reading experience
* Apply paddings to the left and right edge of the screen. If the text touches the browser window, it looks ugly and removes focus and call to action on it.
As a final advice: get yourself a copy of Design for Hackers ( http://bitboxer.de/2012/02/05/design-for-hackers-reverse-eng... )