Drop down menu help

Can any one please open the link which shows my project, once you preview my prototype, I am having a problem, where i have created a dropdown menu, and i am having some error. You can see it if you preview the " create your own cakes" page. Please help me any one…! Thanks in advance…!!!
here is my project link

What do you mean by “first object is on top”?

This means the foreground object. This object should be at the top of the layer stack, or in other words, above all other layers that it should overlap.