How to style map popup from GMap module?
infobubble.js is available as a patch: Add more theming options to popup bubble by using infobubble library plugin for Gmap module.

Have a look at it as it allows you to modify several parameters of the popups.


  shadowStyle - Options: 0 (no shadow), 1 (default shadow), 2 (sharp
  shadow)
  padding - Like the css property, the padding of the bubble.
  borderRadius - Like the css property, the radius of the bubble's
  corners.
  borderWidth - Like the css property, the width in pixels of
  the border.
  borderColor - Like the css property, the hex or rgb color
  of the border.
  backgroundColor - This is the background of the content
  of the bubble, but NOT the entire bubble itself.
  bubbleBackgroundClassName - A css class for the entire bubble.
  minWidth - Like the css property, the minimum width of the bubble.
  maxWidth - Like the css property, the maximum width of the bubble.
  minHeight - Like the css property, the maximum height of the bubble.
  arrowSize - The width of the pointer arrow. NOTE: if you choose an
  arrow style that only uses half of the arrow, this number will be
  twice as wide as your arrow at its widest point.
  arrowPosition - The
  percent from the left of the bubble where the arrow will appear.
  arrowStyle - Options: 0 (full triangle), 1 (half triangle leaning
  left), 2 (half triangle leaning right)
  closeImage - The url of the
  image to use as the close button for the bubble An example of most of
  these options can be seen on the infobubble examples page.