Custom hover scale issue (Code Block)

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Hi, I'm an amateur testing some coding, and require some hover coding help.

I've made a few coding blocks with images to enable a custom lightbox setup.
I'd like the image to scale up on hover, but am unable to keep the image scale within the divs bounds.
I've attached examples of how the image scales up beyond its original borders.

Could anyone be so kind as to help me solve this?