plugin:cform

Hi everybody!
i am using the plugin cform and everything is running fine . but i have just one problem that i don t know how to fix it.the backgroung of the select box are blue..and i want another color. i tought that was a css story and i got crazy. no way to change this color.then i disabled the css and the blue still appear so it is not a css story or what?if you have an idea please i would appreciate any advice.i am pretty new in wordpress ans sometimes i get stuck for simple things. thank a lot in advance!
Davidandre