How to change size of images in prev/next arrows?

Hello, I am curious how to change the size of images that appear in the previous/next arrows on blogs? (CSS: fixed-nav-prev and fixed-nav-next). The space that’s provided/laid out is square, but the images are getting sized down to rectangles so there is an ugly black box underneath each image. Either making the image space a rectangle too, or cropping the images to be a square, either one to just get rid of the black background and empty space under each image?

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