CSS depend on process var

Hi!

I'm using 5.10.1 version. Sometimes I have done changes in default CSS forms, but now I need one more step, and I dont know how do it.

I need that CSS set a different image and colors at form depending on the type of user. To know the type of user, I need get the value of a process var, but I dont know how do it with Bonita

Some idea?

Thanks and regards