Fitgrd is divided into twelve columns with percentual widths. Each column has two percent of margin on both sides. A documentation will be provided very soon. Please take a look in the source code for now. You will definitely get a very quick understanding of how it works. I'm not a friend of heavy usage of media queries. So i included just one for the size of 30em (480px) and the media queries for IPad. Write smart code and you will not need more.