Recently we were developing a custom Google map web application for a client and noted that the close button was not showing in the marker info window. We found that this related to a Bootstrap conflict (in our case via the wonderful Pagelines DMS) with Google and luckily the fix is rather easy to implement. Just add the following code to your CSS:-
/* FIX for Bootstrap and Google Maps Info window styes problem */ #map-canvas img[src*="gstatic.com/"], #map-canvas img[src*="googleapis.com/"] { max-width: none; }
We’ve used the standard ID of ‘#map-canvas’ but if your differs then be sure to update it to target the map correctly.