Fixed menu style

Hi, I just use one link in menu, because this I don’t want change menu to “hamburger menu” I just need the “portfolio” stay showing…

I wish you can understand what I need. Thanks a lot.
the site:


Try this CSS code, please. You can put this code into Customize > additional CSS

@media only screen and (max-width: 1024px){

	.btn-menu {
		display: none;
	#mainnav-mobi {
		display: block !important;
		background-color: transparent !important;
		position: inherit;
		padding-top: 0;
	#mainnav-mobi li {
		padding: 0;