Whatever you enter in the CSS mode gets merged with other CSS. It's not supposed to show existing CSS. The themes are stored in /sap/public/bc/themes (productive) and /sap/bc/theming/themes (development) . Use transaction /UI5/THEME_TOOL to list the themes stored in the system. The newest version is SP07 patch 1. I don't think there is a dependency, if there were it would be with the SAP_BASIS component and you didn't mention the SP level that you currently have. Have you read the documentation? It pretty much covers everything.
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