CSS template for ebooks in EPUB format

Hi, we would like to edit the CSS styling for our eBook’s (which are published in EPUB format). This will involve editing our existing PHP code which pulls the content from our database and produces an ePub file. Things to be done: 1. Style NCX navigation to become a 2 level NCX Navigation "TOC" (a) Chapter Title (b) Short Introduction of title Here is a link to more information about "Table of Contents" styling: [login to view URL] 2. Set general style of ePub A link to a sample of how we would like our NCX Navigation and style of our ePub file to look like is below. http://www.amazon.com/PHP-MySQL-Development-Developers-Library-ebook/dp/B000VMBXEY/ref=sr_1_6?s=digital-text&ie=UTF8&qid=1406402978&sr=1-6&keywords=php (Click cover to view the table of content layout) Thanks