Missed "close button" in popup window

Hello. Firstly thanks for a great plugin. But I’m having a small problem when working with it. I have no corect “close button” in the pop-up window. I hope you can help me how to fix it, or delete it.

Here are the links:
http://teatralni.webuda.com/maket/plan/
http://teatralni.webuda.com/maket/wp-content/uploads/2015/04/1010.png

Thanks a lot.

https://wordpress.org/plugins/imagemapper/