not mobile friendly

I am testing this plugin for a client. It took a while to find the [X] to close the display because I am logged in and the tool bar obscures it. That said, it seems to work reasonably well on a laptop computer, but it is not responsive. The first page is only half visible and the second page is only half visible (the other half).

So — while it looks promising for a desktop/laptop it seems hopeless for mobile users.