First link “Forside” is the way it should be. Clicking “Guides” the color changes. I have tried uploading the original style.css. I tried changing it in custom.css – no luck with both.
When I view source from webpage, this line is there:
.themonic-nav .current-menu-item a, .themonic-nav .current-menu-ancestor a, .themonic-nav .current_page_item a, .themonic-nav .current_page_ancestor a { color: #ffffff; font-weight: bold;