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

  .topnav {
    overflow: hidden;
    background-color: #333;
  }

  .topnav a {
    float: left;
    display: block;
    color: lightgray;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
    background-color: #333;
  }

  .topnav img {
    background-color: #333;
  }

  .topnav a:hover {
    background-color: #ddd;
    color: black;
  }

  .topnav a.active {
    background-color: #614274;
    color: lightgray;
  }

  .topnav .icon {
    display: none;
  }

  @media screen and (max-width: 800px) {
    .topnav a:not(:first-child) {
      display: none;
    }
    .topnav a.icon {
      float: right;
      display: block;
    }
  }

  @media screen and (max-width: 800px) {
    .topnav.responsive {
      position: relative;
    }
    .topnav.responsive .icon {
      position: absolute;
      right: 0;
      top: 0;
    }
    .topnav.responsive a {
      float: none;
      display: block;
      text-align: left;
    }
  }