Custom Menu Drop Down CSS Issues

Hello friends! I created a custom theme and I was finally able to input the custom menu option into my navigation. http://www.amandaduncan.com/site/ Right now I’m stuck as to what css to put for the drop down links. As you can see “about” is a drop down link under the home link (it is reading the custom menu correctly cause I have “about” indented under home). If I put the link as “hidden” the whole menu disappears. I just want it to work like a drop down should…it shows when you rollover the main link.

Can anyone point me in right direction for this? Thank you!!!!!