I have been given an external stylesheet (.css file) that may not altered in any way whatsoever. However I need to apply this stylesheet to a single div and therefore the co
I suggest you can leave the external style sheet as it is and create an internal style sheet with the classes that you want from the external stylesheet to affect your single div and just rename it and apply those renamed classes to the div. The renaming is because the attributes of those classes may affect elements already existing on the page from external stylesheets.
Hope this helps.