My website use google maps and display popup (InfoWindow) when clicking on markers. I don't know why and since when, but actually the popup background is transparent.
Can anyone help me understand?
UPDATE after good answer of Dr.Molle
Wrong code :
var infoWindow = new google.maps.InfoWindow({maxWidth: '500px'}), mapsMarker, i;
Good code :
var infoWindow = new google.maps.InfoWindow({maxWidth: '500'}), mapsMarker, i;