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Dynamic collection gallery with irregular images description on hover

Hello,
I have a collection list that works as a gallery and now I want to add a description of each picture that will appear on hover. To be precise I want another div block that would be placed over the image and on hover it gets darker and the description shows up. However I do have a problem with the div, because it is not adjusting its height to the image and having images with different sizes I can’t determine it manualy. Do you have any idea how this can be solved?


Here is my public share link: [LINK][1]
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