Problem with css and tables

Hi people: I have a problem with css but probably it is because I know very little about them and I hate them ahaha. I have a Pier table with |s The thing is that I want to put a particular css to those tables (the one I create in a page with |s ) but not to ALL the html tables the Pier render. If I change in my css table for example, it will affect to all pier tables: when crating a component, when adding, editing, etc... I can create another css class (tableForMyTables for example), but then I should change Pier code so that it renders tables with my css class instead of the standardone. Does anyone know how can achieve this? Perhaps adding a div for my tables? but I don't know what do to then haha. Thanks for the help! Mariano