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What could I improve ? Had difficulties concerning image purple coloring, any advices ? Not really sure with the responsive part, any tips to improve ?

Is it a good implementation from my side ? Can you tell me what I could optimize in css ? I had difficulties to choose the value of min-height or min-width, did I do correctly ? For the resizing in smarphone model, I did not succeed to do it with grid so I traded it with flexbox. Can you tell me how to do it ?