[Theme Alchem] Navigation and Apperance on Mobile Devices

Hey, I am using the beautiful Alchem Theme but i am struggling with two things.

First:
My Manu is not working on mobile devices as i cannot click on the toggle navigation bars. Nothing is happening here on homepage and on other pages it kind of works but appears behind the title bars.

Second:
the body of the frontpage on mobile devices is set “relative” but it is not i think. Having a look at the frontpage it is only shown in two third of the space.

The website is: https://www.ae-skinbalance.de

Thanks!