Resize Product images on mobile Dawn Theme

[Ulysse12342]

Hello, 

I would like to remove the spacing on the left and right and the spacing at the top and bottom of the images so that the image takes up all the space on mobile, but I don't know how to do it.

Does anyone know how to do this please? 

Here is my website: https://pqd9ge-cs.myshopify.com/products/brightening-eye-cream