Problem with tab in mobile view

Hello, my name is Alberto; i have a problem with images into tab element in mobile. here is the link to an example:

http://test.grumelliepennati.it/attivita-produttive/

take a look please to any image (and space below) into the tabs. You will see only a very small portion of the image, and a big blank space before (that could used to show the rest of the image).
I have take a look to the responsive option of the module, but for mobile there isn’t any option (“Default value from width attribute”).
Please give me a solution to fix this problem, thanks

Alberto