Frozen area at the bottom of screen - how to remove it?

Dear Developers and Gurus of beloved Sydney Theme,

My name is Julien and proud user of this great theme.

Wp version is 5.1, elementor is v2.5.3

My plugin for pop up is Supsystic pro.

The issue :

On my sales page I want to add a pop up for mobile users that opens right at the bottom of the screen. However currently there is a blank/frozen area that prevents my pop up to open right at the bottom.

As a new user I cannot upload 2 images so I shall upload an example of what I want to achieve below as a comment.

I have also tried this on desktop and same problem (although not so potent because of the space to see the content).

I originally thought it was the back to top button that created the issue but I used the other models and the ones without the back to top button generate the same issue - still the annoying frozen rectangle below my pop up.

So guys… What to do ?

Thanks a lot in advance, Julien

The result I would like to achieve (mobile view)

You can see the plugin is glued to the end of the window.

Hello Julien,

Can you please provide a link to your website?

Kind Regards, Roman.

Indeed

Is the page causing the issue.

Hello Julien, thank you for the link.

It looks like that plugin issue, so you can try to contact its support and see what they say.

Please feel free to ask any other questions that you might have.

Kind Regards, Roman.