Changing overlay color on hover for different images

I'm trying to sort out the CSS that will allow me to change the overlay color of individual images. On my home page I'd like each of project to have a different color when you hover over it. Currently the overlay is white for all images.

I imagine it's a simple piece of code, but I haven't been able to figure this one out.

Thanks for any help! Link to my site below.
 

https://www.astnmrtn.com/

My testing

18 hours ago, Beyondspace said:

Try adding to Home > Design > Custom Css

section[data-section-id="6373bc904b5f15018776d1b3"] .portfolio-grid-overlay .grid-item:nth-child(1) .portfolio-overlay {
  background-color: red; 
}


section[data-section-id="6373bc904b5f15018776d1b3"] .portfolio-grid-overlay .grid-item:nth-child(2) .portfolio-overlay {
  background-color: blue;
}

Here is the code for setting overlay color for the first and the second item

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Thank you so much! Exactly what I was looking for. I really appreciate it.