"Search-glass"-icon in the promary menu

Running latest WP with latest theme ver. on fleksjobbernetvaerket.dk Please see: https://snag.gy/bjx8YR.jpg AS you can see I have set the "search function" to appear in my primary menu. I wonder ... how I can have this little tiny search-glass ... very little search glass ... so tiny it is ...... to appear in the same line as the rest of the menu? Thank's gods // Knud