I will explain based on the image below that I did to make it easier to understand.
In the image below I have a banner (gray color) and a bigger one in red.
The operation would be as follows: When you hover your mouse over the gray colored banner, it would open the red banner. But, the red banner would always open in the same coordinate (position) regardless of the size of the gray banner, as you can see below.
I hope you can help me.
Thank you!