How to input CSS layouts for tabbed design?

Hello and good day TechyV users and IT experts!
I have a big problem with inputting layouts on my XML. I was to input CSS layouts on it but I am having a hard time doing it. I have 5 XML documents with tabbed designs. So guys, does anyone of you know any steps of inputting CSS layouts for tabbed designs? Any help would be nice and highly appreciated. Thank you very much.
Vivian Drakees
