Weird style of the info box when clicking place markers

Hi,

I'm using the Google Maps plugin and everything's working fine except a little detail: when clicking on a place marker, the info box is styled in a very weird way. Here's a screenshot: http://img836.imageshack.us/img836/1672/capturadepantalla201111el.png

And here's the actual web with the plugin working: http://www.mtcbcn.com/localitzans/

Any help will be appreciated!