This document discusses CSS skinning, filters, and effects in Flex-based websites. CSS skinning allows changing the appearance of UI components through CSS stylesheets or MXML tags. Common filters include bevel, blur, drop shadow, glow, and gradient filters, which have customizable properties. Flex offers many built-in effects like blur, fade, and rotate that can be applied to UI components through parallel or sequence effects upon events. Resources for exploring Flex styles and effects are also provided.