How to Change an Image Dimension on mobile's mode?

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I've been searching a bit on the forum and I understand that Shopify decided to make all of its themes mobile responsive, meaning that we cannot have two different versions for desktop and mobile versions.

However, I saw that there's apparently a way to force the code to display images in a different size when on mobile mode. Here is a more visual explanation of the issue and what I'd like to accomplish by resizing (to un-zoom) the pictures in the first two slides: 



How could I do that to change the dimension of the slider's images in mobile mode while keeping the initial dimensions when on desktop? 


 I'd greatly appreciate some help, that would be amazing! 


The website URL:


Please let me know if you have any question,


All the best,

Anne & Joseph