I am trying to include many different hover selectors on just a simple img tag. They would just explain each part of the image in words. Because I cannot work with classes or IDs, I will need to find out the current position of the cursor first. 

I tried it this way but the problem is, if I resize my browser the values are no more the same. Is there a way I could fix this problem or is there another way to realize what I want to do?