.circle{
  position: absolute;
  border: 1px solid red;
  background: rgba(255,0,0,0.3);
  border-radius: 20px;
  width: 20px;
  height: 20px;
  top: -10px;
  left: -10px;
}

.center{
  position: absolute;
  top: 9px;
  left: 9px;
  border: 1px solid red;
}

#map{
  width: 600px;
  height: 600px;
}