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Custom code to resize specific images in a CMS collection

I have created the website using CMS collections & webflow e commerce.
For example on certain projects I am happy with the size of the image on desktop but not on mobile.
And I if I change the image size it will apply to all my slide one (of all projects) etc

So is there a custom code perhaps which would help me vary the sizes of a few specific images in a cms collection at certain breakpoints ?

Here is my site Read-Only: [LINK][1]
([how to share your site Read-Only link][2])