If you mean you want to edit the styles of a particular model's list view within OpenERP, that is not possible with pure CSS. The list view CSS rules will apply to all list views regardless of model.

You could do it with a lot of hacking - I'm talking about a custom module which uses javascript to dynamically load a css file based on the model name - data which may or may not be available at the front-end to javascript anyway.

However, you can define colours for rows in a listview based on a domain:

See this link