hi
i have a problem here: http://www.quartofilm.com/wordpress/ in the menu bar.
the dropdown vertical menu in "film" button creates white spaces.
here the css code i added:

ul.rMenu-hor li
{
float: right !important;
width: auto !important;
}

div#menu1 {
margin-right: 11px;
margin-left: 300px;
border: none;
margin-top: -70px;
}

can you help me please?
thank you

(This solution works for me in Atahualpa 3.7.7)

I've been trying to find the answer to this for ages and kept coming across this post, so I thought I'd post a response when I finally found one.

Add the following code to the Atahualpa Theme Options >Add HTML/CSS Inserts>CSS Inserts at the very top:

ul.rMenu ul {background:transparent !important;}

lmilesw originally suggested this solution in the thread, http://forum.bytesforall.com/showthread.php?t=7511