In the CSSMenuWriter/cssmw/menu.css file, edit:
ul#cssmw {
cursor: default;
list-style-type: none;
margin: 0 0 0 0;
padding: 0 0 0 0;
}
to:
ul#cssmw {
cursor: default;
list-style-type: none;
margin: 0 0 0 0;
padding: 0 0 0 0;
position: absolute;
z-index: 9999;
}