RichWidgets CSS

My page has a few CSS files which have a path like - <link href="/RichWidgets/Blocks/RichWidgets/RichWidgets/DropDownMenu.css?8504" type="text/css" rel="stylesheet" />

I’d like to know -

  • how and where the properties of these files are located?
  • Can I change the properties of these files directly?
  • Can I delete DropDown.css and merge the properties it has with my base CSS?
I am curious why you even want to change all that css.
css is cascading, so you can override details.

I dont want to change it. We are making a common CSS file, want to merge it with it. Is that possible?