I am using jQuery Fancybox for a popup registration form here
I would like the form to come up at the size of 450px by 700px but no matter what I set the height and
I had I guess the same issue. It wasnt what the fancybox properties or CSS was, but the main css for my site.
if you have something like
div {overflow:auto;height:auto;}
for a inheritable/root in your site css then it will cause scroll bar issues in the fancy box. Remove and make your HTML and CSS more precise with IDs and classes