/*lways set the map height explicitly to define the size of the div element
 * that contains the map. 
 *  */
#travelmap {
  height: 100%;
}

/* 
 *  * Optional: Makes the sample page fill the window. 
 *  
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}
*/