body{
    background-color: deepskyblue;
  }
  .mapdiv{
    width:100%;
    margin: auto;
  }
  
  .mapdiv polyline {
    fill: #cc1100;
    stroke: #fff;
    stroke-width:3px;
    transition: fill 0.1s;
  }
  
  .mapdiv :hover {
    fill: blue;
  
  }