Hi,
I wanna modify the css for my application, but I´m new to this. I´ve looked at the gxt-all.css file and I´ve seen some fields with the same name so, I don´t know which one is the correct one to modify. It would be helpful knowing the nomenclature followed in this file.
One example of what I´m saying is the "x-menu", which appears twice.
It can appear as often as needed. Importend is the content of the selectors. You should read up on how it works, there are many tutorials out there for css.
I answered your questions. This is how css works. You can have the same selector as often as needed. They can even use the same content. The last defined rule will simple override the first one (if the rule matches).