TreeView Menu Design

I don’t know if this is the right section for this issue. I am having a trouble with the design of my page because of the treeview menu. I am using a treeview for the purpose of issuing accessibility of users regardless of their position. Actually, the treeview menu control overlay the footer whenever I expand on it. How am I be able to dynamically adjust the height of the <div> for the treeview menu. Can anyone give me an idea.

How could we know what to say without seeing it?