img {
    width: 80%;
    display: flex;
    flex-direction: column;
    align-items:center ;
    margin-right: auto;
    margin-left: auto;

}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
  }
  
  .topnav {
    overflow: hidden;
    background-color: #333;
    position: sticky;
  }
  
  .topnav a {
    float: left;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
    position: sticky;
  }
  
  .topnav a:hover {
    background-color: #ddd;
    color: black;
    position: sticky;
  }
  
  /* Create a right-aligned (split) link inside the navigation bar */
  .topnav a.split {
    float: right;
    background-color: #333;
    color: white;
    position: sticky;
  }

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

  h2 {
    margin-left: 10%;
    margin-right: 10%;
  }

  p {
    margin-left: 10%;
    margin-right: 10%;
  }

  .sub {
    background-color: rgb(255, 153, 0);
    padding: 10px;
  }