.row {
      display: flex;
      flex-wrap: wrap;
      padding: 4px;
      margin-left: 2px;
      margin-right: 2px;
      margin-top: 2px;
      margin-bottom: 2px;
      border: 1px solid #cccccc;
      border-radius: 4px;
      background-color: #e9e9e9;
    }

  /* Create four equal columns that sits next to each other */
    .column {
      flex: 20%;
      max-width: 100%;
      padding: 0 4px;
      margin-top: 2px;
      margin-bottom: 2px;
    }

    .para{
      line-height: 1.3em;
      padding-left: 20px;
    }

    .linktab{
      display: block;
      text-align: center;
      width: 100%;
      background-color: #f6f6f6;
      text-decoration: none;
      color:black;
      border: 1px solid #cccccc;
      border-radius: 4px;
      padding-top: 5px;
      padding-bottom: 5px;
      font-variant: small-caps;
      font-weight: bold;
    }

    a{
      color: brown;
      text-decoration: none;
    }

    #tab0, #tab1, #tab2, #tab3{
      padding: 20px;
      display: none;
    }

    .linktab:hover, .linksel:hover{
      background-color: #e9e9e9;
    }

    a:hover{
      color:red;
    }

    .main{
      padding: 4px;
      border: 1px solid #cccccc;
      border-radius: 4px;
      margin: 20px;
    }

    @media (max-width: 800px) {
      .column {
        flex: 100%;
        max-width: 100%;
      }
    }