Area not clickable where SlideIn window appears

Dear Team,

I have installed SlideIn plugin and set it up that when you scroll down 25% of the page it appears on the right side. I have also hided close button through CSS.
But the horizontal area where the SlideIn window appears is not clickable anymore. And this area moves with the SlideIn window (when you scroll up/down the page)

Could you please check?

Thanks
BR
Stefan