Hide Mobile Menu

hey Anders,

Do you have a CSS that works to hide the menu on mobile?

Ive tried

@media screen and (max-width: 990px) {
    .mobile-menu-one #site-branding { padding: 0; width: 100%; }
} 

and

#menu-toggle {
 display: none;
}

neither seem to work,

thanks, ConVer93