My problem with the Top Users widget is not solved

I want to create a top users only with the profile picture, like that:

I have already try it but the widget display that:

I just want the profile picture without the username or any indication about the user activities.

There is the page to configurate the widget. What I have to change to display only the profile picture? Or do you have any CSS code text to do it?

Thanks!

Manel