XF 1.5 Background for some parts different


I have a question.
So I have this site it's edited UI.X: click here
But now I want to make the background around the elements transparent but only for the home page (xenporta) and the forum. Like this http://imgur.com/BYSWhnX as you can see the white background is gone and it's transpartant so the signup box isn't connected with the rest. But I don't want it at a page node and not if you create a thread and not for threads it self so I can't just set it to transparant. Do you guys know if it's possible to only make it transparant for only 1 page ? and not everywhere ? If so could you please tell me how :D
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