NAVIGATION
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http://www.w3schools.com/css/default.asp (One of the best sites around css stuff).
23 Pure CSS Effects/Solutions to Make JavaScript Angry!
Pure CSS Menu.com : Free CSS Drop Down Menu Generator
SitePoint Reference: CSS, JavaScript, HTML Very good stuff.
http://www.style-sheets.de/ Eine der besten Einstiegsseiten zum Thema CSS.
CSS 4 you - die deutsche Seite für Cascading Stylesheets (CSS)