You can adjust the value in the height from 86px to something else to get it to the exact position you’d like it at.

The below seems right for the mobile layout, gives this result: http://screencast.com/t/me7CTS0DxN

@media only screen and (max-width: 990px){
#mainmenu {
top: 178px !important;
}

#top {
height: 182px;
}
}