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Why are all my hover states linked together?

I am trying to remove the hover box that appears only on the “logo” work on my portfolio website. I do not want it to link anywhere. But when I try to create a new class for those specific divs, it is linked to every other hover box as well. What am I doing wrong?
I have highlighted the box I wish to remove on this screenshot. But when I try to hide it here it hides on every gallery thumbnail. When I try to create a new class, the new class appears on every thumbnail.

Here is my site Read-Only: LINK
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