@media only screen and (max-device-width: 600px) {
  #leftbar {
    visibility: hidden;
    float: left;
    width: 0px;
    /*	margin-left: auto;
    margin-right: auto;
    margin-top: 100px;
    padding-right: 10px;
  */
    border-right: solid #b6b6b6;
    border-right-width: 1px;
  }

  #leftbar a {
    color: Grey;
  }

  #leftbar a.current {
    color: Navy;
  }
  .content a {
    color: darkblue;
  }

  .content p,
  .content img,
  .content h2 {
    margin-top: 10px;
  }

  .content h2 {
    font-weight: bold;
  }

  .content li {
    display: block;
  }

  .content span.note {
    color: darkred;
  }

  .content table,
  th,
  td {
    border: 1px solid grey;
  }
}