Map appearing in smaller size

Good afternoon!
I was all happy with this plug in until I found out that my map is suddenly not showing the way it used to. Once, the map was full size, covering the entire width of the page.

Then – totally out of the blue as I haven’t changed anything in settings – the map got smaller and moved on the left hand side of the page, leaving a white bar on the right (even though it is set to be aligned in the center).

What happened? I haven’t installed any new plug-ins, so I don’t think there’s any conflict.

Please help me resize it, thanks!
cristina

The page I need help with: [log in to see the link]