Ok that’s easy enough to adjust. In the responsive.css file (not the style.css) add the following in the bottom before the last closing tag.

#mainmenu {
top: 178px;
}

Which will give you this in the mobile view – http://screencast.com/t/9wEmioRnuN

For the desktop. In the standard style.css.

#top {
z-index: 10;
}

#top {
height: 86px;
}

Which should give you this: http://screencast.com/t/sxyxqL8q1