body{
  font-family: 'Droid Sans', 'Helvetica', Arial, sans-serif;
}

#cabecera{
  margin: 5px;
  padding: 5px;
  border: 1px solid black;
  position: absolute; 
  top: 0;             
  left: 0;
  right: 0;
  background-color: lightblue;
  overflow: auto;
  height: 85px;
}

h2 {
  margin: 5px;
}

.ayuda {
  font-size: x-small;
}

#map{
  margin: 5px;
  padding: 0;
  border: 3px double black;
  position: absolute;  
  top:  100px;     
  left: 0;
  right: 0;
  height: 100%;
  background: lightblue; /* verde si no hay mapa */
  min-height: 300px
}