I have successfully added Navigation Control to my map, however the buttons are blank, no '+' or '-' on either of them. Is there another option I can use to place the '+' or '-' on them. Here is the code I used to create the Navigation controls.
this.map = new MapboxGL.Map(mapOptions);
var nav = new mapboxgl.NavigationControl();
map.addControl(nav, 'top-right');
I have seen similar examples using Mapbox Leaflet's zoomInText and zoomInTitle. Is there something similar I can use in Mapbox GL?
mapbox-gl.css
CSS file on the page? – Lucas Wojciechowski