CSS (Cascading Style Sheets) allows web designers to separate the presentation of a web document from its content. Two of the main benefits are that stylistic decisions are localized, making it easy to change formatting across the entire document or even website, and that the same content (usually in HTML or XHTML) can be used to create specialized presentations for media such as print, voice, and mobile phones.

CSS and INDI

99% of the INDI look-and-feel is defined using externalized CSS files. Both the INDI user interface as well as each plugin use these CSS files. The INDI user interface also utilizes a CSS-based theme architecture which can be extended to fully customize the INDI user interface.