position:fixed elements don't stay fixed

[Lezuzius83]

I want the hamburger menu on the top right corner of the site (https://kadar-kocka-felujitas.hu/) to stay fixed when scrolling.
It is set to fixed position, but get scrolled with the rest of the section.
If I give it a CSS ID and add that ID to the Design / Fixed elements section, the whole hamburger menu disappeares instead of being fixed in place.

[alvarotrigo]

You'll have to use the Fixed Elements option and put in there the selector for your menu, in this case #hambi:
https://alvarotrigo.com/fullPage/wordpress-plugin-elementor/docs/#fixed-elements

Make sure it has a high z-index value.
For example:

#hambi{
    z-index: 99999999;
}

[alvarotrigo]

To make it look the same you might need to apply some extra CSS:

#hambi{
    z-index: 999999;
    right: 160px;
    top: 70px;
    position: fixed;
}
#hambi img{ 
      width: 55px;
      height: 55px;
}