html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

/*
 * Always set the map height explicitly to define the size of the div element
 * that contains the map.
 */
#map {
  height: 75%;
  width: 75%;
  margin: auto;
}

.w3-card-4{
  
  width: 50%;
  margin: auto
}