Google maps offline map api-3 infowindow

问题:

I'm trying to develop offline Google map with some markers. I have done it well. I'm using Offline Google maps api-3. Here my problem is showing infowindow(). When is use online map my infowindow() shown like this , but when I use offline map the infowindow() showing like this . in Online map, the marker indication corner is small, but in offline map it's bit larger than online map infowindow(). I want to use infowindow() similar like online map infowindow(). I would like to reduce the corner size of infowindow() in offline map like this . How can I solve this ? now I'm using infowindow.js which is inside mapfiles of offline map package. is I need to download any other version of infowindow.js or need to modify the same js. kindly help me .