In the last tutorial we discussed the basics and syntax of CSS, where to write the files and how to apply them to our pages. In this brilliant article, we will go over how to apply styles to backgrounds and text. So let's get busy.
The values at which you can set the position are: top left, top center, top right, center left, center right, center center, bottom left, bottom center, and bottom right.
You can also position the image using the x% and y%, in this manner:
Style Sheets 
HTML5 Boilerplate Introduction
