I had the same problem.
My problem was that if I changed the z-index to> 0, there would be problems with the design of the fault.
Since my page had static elements, I made the buttons paste them into their positions, but without them in a container with other elements.
I have had:
.container#body-container #menu-buttons .menu-item#One .menu-item#Two .menu-item#Three .menu-item#Four .menu-item#Five
when it all started and I changed it to
#nav-menu-container #One #Two #Three #Four #Five .container#body-container #menu-buttons .menu-item .menu-item .menu-item .menu-item .menu-item
I know this is a bit hacky, but this is the best I've received so far.
ditoslav
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