Making header transparent in vBulletin Cloud

[Traplight]

Hi, I have this problem with vBulletin Cloud.

I need to make the forum header transparent, but in the cloud version you can't access the additional.css-files or anything on the server end, so I will have to do with the CSS Editor (located in the front page of the forum in admin mode).

I have tried this thread's instructions (in post number 4) on how to make the header transparent:
Make the header transparent

But the results are the same as in post number 5, this code makes the wrapper transparent also. This code does the same thing when added to the CSS Editor:

#wrapper {
background-color: transparent;
}
#header {
background: transparent;
}


It would make sense to change the wrapper color with a hex code and it wouldn't affect the header, but it does. If wrapper colour is anything but transparent, it also colors the header.

Does anyone have any idea how to get around this problem without accessing the source codes? I really need help with this, as many days of Googling and searching these forums hasn't helped.

Thank you so much if you can help!