How to place an image that fits in the product description perfectly?

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I am trying to place an long image in the product description inside the product page, but I am not able to place it "widescreen". To leave it without white sides or at least to minimize it, being aligned with the rest of the description items, I would like to know which dimensions of the banner / image to upload and not have this problem! I am using brooklyn theme and want to solve the problem for mobile viewing. << my site