heymvp

I need help! I want my portfolio page gallery to be Black and White but turn colored when the mouse hovers over it. I am having trouble finding a solution. I only want this for my portfolio page, nothing else. My website is https://www.heymvp.me/ if that helps! The best example of what I am looking for that I could find was this portfolio https://havery.studio/portfolio (they were asking the same thing on this forum, but the code that worked for them did not work for me)