Hello, Freena!
That can be solved by adding the background-color below the image…(I’ve already inserted it for you)
https://prnt.sc/llm1im
I also think that the hover-boxes will look better if you give them the same height, so I added the min-height value to the code. In that case, the height of the hover-box wrapper should be increased too, so I did that.
https://prnt.sc/llm4f4
Next, I added the custom CSS to remove the shadow below the main wrapper.
https://prnt.sc/llm5bm
Also, I noticed that you removed the main header, but you still get a header when scrolling a page (semi-transparent sticky header), I assumed you did not need it, so I added the CSS code to remove it.
https://prnt.sc/llm8cp
I hope everything is fine right now. If you have any further questions, feel free to contact me again.
Best Regards