How to resize fancybox window?

Question

fancyBox

The fancybox plugin is used as a popup.
The problem is that on devices with a resolution of 320x480 (iphone 4), the height of the popup does not fit into the viewport area.

I can't scroll down because it's fixed
. The only option left is to make the popup fill the entire viewport area with the ability to scroll.

Maybe there is an option in this plugin that activates this window behavior? Or "no, it won't work, do it again", or use another solution