.zoom {
  transition: transform .5s; /* Animation */
  margin: 0 auto;
}

.zoom:hover {
  transform: scale(1.1); /* (150% zoom - Note: if the zoom is too large, it will go outside of the viewport) */
}

.map-responsive{
    overflow:hidden;
    padding-bottom:56.25%;
    position:relative;
    height:0;
}
.map-responsive iframe{
    left:0;
    top:0;
    height:100%;
    width:100%;
    position:absolute;
}