body {
      margin: 0;
      font-family: Arial, Helvetica, sans-serif;
    }

    .content1 {
      margin: 0;
      font-family: Arial, Helvetica, sans-serif;
      padding-right: 30px;
      padding-bottom: 50px;
      padding-left: 80px;
    }

    .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: #4CAF50;
      color: white;
    }

    .center {
      display: block;
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }

    .center1 {
      display: block;
      margin-left: auto;
      margin-right: auto;
      width: 25%;
      width: 25%;
      text-align: center;
    }