centering zoom image

Hi everyone, not sure if I'm posting this question in the right place (I'm a newbie!), but I was wondering if there was a way to center a "zoom picture" image.  When I create a zoom feature on an image so users can see it larger, the large image aligns to the right of the page.  Does anyone know if there is a way to center it on the page when it's zoomed?

Thanks for your help!