Problem with Royal Slider Plugin

Hi,

I want to use the Royal Slider Plugin for the gallerys. But there is one problem…if you click on the arrows at the right site of the gallery to maximize the size, you’ll see that the menü is overlapping the gallery.

http://dev.promicabana.de/das-ist-eine-testgalerie/

I don’t know if this a problem of the theme or the plugin.

Thank you!

I found out that the Z-index is the problem. But if I change it to 1, the search dropdown box disappears.

.td-header-main-menu {
background-color: #222222;
position: relative;
z-index: 2;
}

Any suggestions?