Admin bar profile menu goes behind the header menu in mobile.

[wpamitkumar]

if I opened in mobile the header menu first and after I try to open the admin bar user profile sub-menu that goes behind the Header menu and not showing other menu items because of too much Z-index of the header menu.

[wpamitkumar]

I Fixed below CSS and its working. Please use CSS z-index: 999; instead of z-index: 100000;.
Screenshot -​https://prnt.sc/q3rw1r

#wporg-header ul#wporg-header-menu {
    z-index: 999;
}

[coffee2code]

In 9444:

wp4: Slightly decrease z-index of mobile dropdown menu so that adminbar my-account menu doesn't appear under it when both are visible.

Also incorporates wp4-rtl.css updates following r9247.

Props wpamitkumar.
Fixes #4856.