In this demo the kalmstrom.com CEO Peter Kalmstrom shows
how to start using CSS on your SharePoint 2010 pages and
explains how to overcome the tricky
part of getting it to
stay.
This demo is rather old, but the method Peter shows
will still work if you use SharePoint Designer 2013 and
the classic SharePoint user interface. (The modern interface
has no Content Editor web part.)
SharePoint Designer is the premium tool for SharePoint configuration,
but if you create a new .css file and then simply add a
link to it in an .aspx file, SharePoint does not save it.
Peter shows how to get around this by editing the SharePoint
page in the web browser and using the Content Editor web
part.