[Plugin: wp-greet] css breaking with wp-greet?

Heya folks,

I’m using NextGENGallery and wp-greet to create eCards on my website.

The problem is that the css seems to break once users have selected one of the images to send. This brings up the page with a form to fill in ‘sender’, ‘receiver’, and ‘message’ fields, but these fields step on the navigation column on the right side of my site.

I’ve posted to the plugin homepage forums, but they seem a bit quiet these days. I did a quick look around here, but didn’t find anyone else with the same problem. Does anyone know how to fix this? I’m not nearly good enough with css to understand where/what I need to modify, so any help would be greatly appreciated!