Facebook menu hidden by widget area

When I hover over the Facebook icon, part of the dropdown menu is hidden underneath a widget area.

Previously, I had a problem with the menu dropping up underneath the header area and was told on this forum to add these CSS rules:

div#sfsiid_facebook {
position: relative!important;
}
div#sfsiid_twitter {
position: relative!important;
}

Do I need to add more CSS code to keep the menu from being hidden by the widget area?

The page I need help with: [log in to see the link]