Can a vaadin portlet gather css rules only of certain .css files?

Hi there,

I just deployed my vaadin application as a portlet in liferay, and many style related issues arose, then all the liferay css rules are interferring with the rules defined for my vaadin theme. I would like my portlet to make use only of the rules defined in my vaadin theme. 

Is there any way to accomplish that?
I have checked and seems scoped css is the concept, but it appears to be in its infancy, and not available/reliable for openpublic browsers, however a feature to come. My problem is that scoping might not be enough. I would need to apply a given set of css rules at a specific node group in my DOM, so say to a given DIV and all its descendants. 

Or on the other side I only have left but to redo my css styles manually.

Thanks,
Carlos.