Default SharePoint CSS Files and Locations
When you install SharePoint, a number of CSS files are installed on the Web front-end server, including CSS files relating to common site tasks and, in SharePoint Server 2010, to publishing functionality. The CSS files located on the Web front-end server are the uncustomized versions of CSS files referenced by SharePoint sites and pages.
Note
You should never directly modify the out-of-the-box CSS files on the Web front-end server. Doing so might cause undesirable results and any changes you make might not be supported by Microsoft. In addition, changes to out-of-the-box CSS files might be overridden when the next product service pack is applied to the Web front-end server. Instead, if you want to ...
Get Microsoft® SharePoint® Designer 2010 Unleashed now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.