body {
            font-size: 24px;
        }
        /* Add a black background color to the top navigation */
        .topnav {
        background-color: #333;
        overflow: hidden;
        text-align: center;
        }
        .topnav a {
            color: #f2f2f2;
            text-decoration: none;
            font-size: 17px;
        }
        .topnav a:hover {
            color: #ffffff
        }
        .topnav div {
            padding: 14px 16px;
        }

    .button {
      background-color: #4CAF50; /* Green */
      border: none;
      color: white;
      padding: 15px 32px;
      text-align: center;
      text-decoration: none;
      display: inline-block;
      font-size: 20px;
      font-weight:bold;
    }

    .button_small {
      background-color: #4CAF50; /* Green */
      border: none;
      color: white;
      padding: 10px 20px;
      text-align: center;
      text-decoration: none;
      display: inline-block;
      font-size: 16px;
      font-weight:bold;
    }

    input {
        margin-bottom: 10px;
    }