Map lightbox appearing underneath top menu bar

I have tried lowering the z-index of the top-menu and raising the z-index of greybox but this makes no difference so I'm kind of stuck for ideas now.

Any suggestions would be much appreciated!

Just thought I'd let you know I've managed to fix this issue, so if anyone else has the same problem this is how I did it.

Change z-index of top-menu and any drop down menus to make sure they are lower than the z-index of the greybox

Clear browser cache

Everything works as it should

Great to hear you get everything works fine. And thanks so much for sharing the solution !

Regards,

Tuan