Preview Card Component(html, css)

This is probably the second project I was working on initially, so I was kind of new to optimizing pages for mobile and desktop devices still. I think the biggest challenge on this one was just changing the dimensions of the product image to be able to fill in the containers for mobile and desktop view without it looking too scrunched up, and it was definitely a grind to reposition and modify the dimensions of the text and button elements. I was initially unsure of whether or not it was a good idea to use just one of the pictures included for both views, like I think I used the desktop image for both mobile and desktop views but after some tinkering I did find out that wasn't that big of a deal. One question I have about best practices I have now, even though I probably could've asked earlier- would it be better to set the min or max width to the precise pixel count of mobile or desktop devices, or is giving it some of the wiggle room perfectly fine like I've been doing? I've mostly been setting it to < or > 600px personally. Feel free to leave your suggestions or feedback with me!