Is it possible to change the white background and border styles of Google Maps API infowindow? I know I can pass custom HTML as content but the white edges are still visible. If it's not possible is using infobox the only other option?
Cheers!
For customized the background you have to refer to InfoBubble of Google maps utility library:
https://github.com/googlemaps/js-info-bubble
Otherwise, here is a nice tutorial for your asking:
http://www.artandlogic.com/blog/2014/02/custom-google-maps-info-windows/
Hope that'll help you