Menu and search doesn’t work on mobile

Hello, When I try to either do a search or click on the menu on the start page on my site a transparent grey layer is appearing over the whole page. It is not possible to click. I have tested in several browsers. Cleared cache. Tested on several devices. Same problem on all. I have deactivated ALL plugins. Still wrong. I have changed pages as start page. Still wrong. Not I hope someone has any more solutions! Thank you in advance.   This is the page: www.studiocaro-lines.com