Slideshow images -> change position

Hey,

i added a width of 4 px to the border to the main frame where the slideshow module is displayed.
since that, the images of the slideshow are displayed 4px more right, so that it's not possible to see the border on the right sight.

where can i change the width of slideshow module?
i've tested it with 4 px smaller resolution of the images, but that doesn't help.

Thanks in advance for solutions!

admin - extensions - modules - slideshow - you can set dimensions for the slideshow there.