Can't scroll, as if a frame is set

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Dear Armin/laythemeforum

First, thank you for the intuitive theme - almost everything is solvable for newbie like me.
Secondly, sorry if such a topic already exists.

Now my problem, my page behaves as if there is a frame set that I can't change. This problem appears on every devise (phone/laptop/tablet) I always use 'set browser height as row height'. Please see the attached screenshots.
Is there problem in custom css/html or does the webhost probably set an iframe or something?
2_1552402772818_Bildschirmfoto 2019-03-12 um 15.52.58.png

Dear @BLUSCH
you probably have the Fullscreen Slider activated for this page, no?

Best!

Marius

Dear @mariusjopen

Thank you for your reply. I use fullscreen slider else where on the page but not on this specific page, and it is also not enabled.

Best
Cecil

Dear @BLUSCH
do you use 100% browser height?

Can you send a link? Then I can have a better look :-)

Best!

Marius

Of course :) www.blusch.ch/buero

I think we solved the problem for desktop/laptop by adding the following to custom css...but it still doesn't work on mobile devices.
body.slug-buero .navbar {
display: inline-block;
height: 100px;
background-color:white;
opacity: 1;
}

And the /buero page loads extremly slow, whereas there is only text

Dear @BLUSCH
yes. The site seems super slow.
Might be a problem with your webhost.

Can you deactivate the theme to see if it is still slow?

Best!

Marius