 make the Palette/Overview/Diagram responsive and size things relatively */
  #myFlexDiv {
    display: flex;
    width: 100%;
    height: 600px;
  }
  #myPODiv {
    display: flex;
  }
  @media (min-width: 768px) {
    #myFlexDiv {
      flex-flow: row;
    }
    #myPODiv {
      width: 105px;
      height: 100%;
      margin-right: 3px;
      flex-flow: column;
    }
    #myPaletteDiv {
      height: 80%;
    }
    #myOverviewDiv {
      margin-top: 3px;
      flex: 1;
    }
    #myDiagramDiv {
      flex