Can somebody tell me what code to use or where to find the code to adjust the spacing of the additional image icons.

At present, if you have two, they are widely spaced, if you have three or more, the spacing changes. I just want to fix this positioning so the spacing doesnt change (basically, I have moved the add images icons up next to the main product image, and want everything to line up and be uniform no matter how many add images I have rather than them being oddly spaced if I only have two for instance)

Can anyone help?