Go Pricing has a huge reset part in its css file, to minimize the css conflicts, but sometimes it's necessary to add custom CSS code for the tables on frontend.
Here are some examples:
You can add custom css to the plugin frontend css file without directly editing css files. Navigate to Components » Go Pricing » General Settings submenu. You can find a Custom CSS code textarea. You can put your code here. After clicking to "Save" button this code will activated.
This method is fast and maintable. You can easily add custom code to the Go Pricing tables without file editing, easily via admin panel. These changes also stored in database, so you won't lost these changes in case of an update.