[Q] Where are widgets theme files ? topic

I would like to ask how to edit the widgets themes css files of the following widgets : LGWeather, LGMusic. I dont know there the css files are located.
I successfully edited theme css files of the Smart Notice Widget from /system/etc/mrg_default_forms/ConciergeBoard/ , but i cant find such thing for LGWeather and LGMusic. Please help me :)