I’ve done it on my website, unfortunately I removed it since I didnt need it but try searching for it.
See if this works:
/*Hide menu on mobile*/
@media only screen and (min-width: 768px) {
#header .top-header .header-navigation {
display: none;
}
}
Can you access the file mentioned? if so, have you verified if all the commas and parenthesis are correct? If else I might not know.
