CSS Designer is now availabe as part of the Web Designer.
JointLogic CSS Designer is an Eclipse plugin that provides CSS authoring facilities like - CSS Styles view, CSS declaration designer with preview and web-oriented color picker. It integrates with Eclipse Web Tools Platform (WTP) to allow CSS authoring while editing CSS, HTML and JSP files.
Come to more detail: http://www.jointlogic.com/cssdesigner/
Recommend the tutorial