body {
  margin: 0;
  padding: 0;
}
#map {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 100%;
}
.marker {
  background-image: url('icons8-bus-64.png');
  background-size: cover;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  cursor: pointer;
}
.map-overlay {
  position: absolute;
  left: 0;
  padding: 10px;
}