#mynetwork {
    width: 400px;
    height: 400px;
    border: 1px solid lightgray;
  }
  .header{
    text-align: center ;
    display: block;
    font-family: sans-serif;
    margin-bottom: 20px;
    margin-top :20px;
    font-size: large;
}

#mychart{
    width: 1000px  !important;
    height: 500px !important;
    justify-content: center;
  }
  #mychart1{
    width: 800px  !important;;
    height: 500px !important;
  }
  #mychart2{
    width: 800px  !important;;
    height: 500px !important;
  }
  canvas{
    margin: 0 auto;
    justify-content: center;
    }
  #cityfilter
  {
    margin-top: 20px;
    margin-bottom: 20px;
    text-align:center;
  }
  #networkcityfilter
  {
    margin-top: 20px;
    margin-bottom: 20px;
    text-align:center;
  }
  #mynetwork
  {
    margin-left: 200px;
    margin-right:100px;
    width: 1000px  !important;
    height: 500px !important;
    justify-content: center;
    display: inline-block;
  }
h1{
  text-align:center;
  font-family: sans-serif;
}
#center {
  margin-left: 200px;
}