@media screen and (max-width: 990px) {
    .wp-megamenu-main-wrapper.wpmm-ctheme-wrapper.wpmega-default-theme .wpmegamenu-toggle {
       display: none !important;
    }
}

@media only screen and (max-width: 990px){
 #wp-megamenu{ 
display: none !important; 
}
}