I use the Google Maps API (v.3) to show a map with a couple of markers. I recently noticed that the control used to zoom the map is messed up (it wasn\'t always like this).
If you're using Bootstrap, just give it "google-maps" class. This worked for me.
As an alternative you might reset everything for the google map div as a kind of last-resort solution:
HTML:
CSS:
.mappins-map img {
max-width: none !important;
height: auto !important;
background: none !important;
border: 0 !important;
margin: 0 !important;
padding: 0 !important;
}