How to align the icon of a marker in google map

What You need is to create a MarkerImage object, for example:

var markerImage = new google.maps.MarkerImage('img/icons/bank_euro.png',
                new google.maps.Size(30, 30),
                new google.maps.Point(0, 0),
                new google.maps.Point(15, 15));

Where first parameter is an image url, second is image size, third is origin point of image, and fourth is position on the image where marker should point.
If your marker is a circle then set fourth parameter to center of the image.
And create your marker passing markerImage to icon property:

var marker = new google.maps.Marker({
  map: map,
  position: placeLoc,
  icon: markerImage
});