Mobile menu overflow CSS tweak/fix

Hi,

I found the following mobile menu tweak from the author in another support thread:

@media only screen and (max-width: 719px) {
.nav ul { display: none!important; }
.nav li:hover ul { display: block!important; }
}

I was not able to provide a follow up on the closed topic for an additional fix to prevent the overflow of menu items when expanding sub-items.

Adding this extra CSS bit makes the menu fully responsive on mobile resolutions (at least on iOS).

#nav-header .expand {
       height: auto !important;
}

Thank you to the author for great support and for providing such a versatile and great theme!

-Cheers