Use CSS-Files of OpenHAB in static html files?

Hey,

I want to design an static html File, where users can give some additional informations to the system.

How can I use the .css-File from the other UI’s of the System (e.g. PaperUI)? Is this possible?

Another Question is: is there the possibility to change the .items or .cfg-Files with help of such an static website?