body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
  }
  
  .topnav {
    overflow: hidden;
    background-color: #333;
  }
  
  .topnav a {
    float: left;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
  }
  
  .topnav a:hover {
    background-color: #ddd;
    color: black;
  }
  
  .topnav a.active {
    background-color: #04AA6D;
    color: white;
  }
*{
    box-sizing: border-box;
  }
  
  .column {
    float: left;
    width: 50%;
    padding: 5px;
  }
  
  /* Clearfix (clear floats) */
  .row::after {
    content: "";
    clear: both;
    display: table;
  }