Reply To: center navigation menu

Hi,
Please add the below CSS codes on Appearance > Customize > Additional CSS,

@media screen and (min-width: 1024px){
	.main-navigation ul{
		display: inline-block;
	}
	.main-navigation ul{
		content: "";
    		display: table;
    		table-layout: fixed;
		clear: both;
	}
	#site-navigation .menu-valikko-container{
		    text-align: center;
	}
}

Hope this works.

Thank you