Using table to help with hover effect

I am trying to create the effect where if u hover over a button , it changes the colour of the button.
I wanted to use a table to store my nodes so that when i hover over each nodes, it refers back to the table, but i really know how to do this
(Sorry if this doesnt make sense, im not good at coding so this is my attempt at trying this)

really dont know how to do this*

It is better if you share your code as text instead of an image. Copy the code here and surround it with three backticks, ```.

Your list of nodes are strings, but gui.pick_node() want gui nodes. Use gui.get_node(node_id) to get the node.

Oh ok, thanks