body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
  }
  header {
    background-color: #4CAF50;
    color: white;
    padding: 1rem;
    text-align: center;
  }
  nav {
    background-color: #333;
    overflow: hidden;
  }
  nav a {
    float: left;
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
  }
  nav a:hover {
    background-color: #ddd;
    color: black;
  }
  main {
    padding: 1rem;
  }
 

  body {
    margin: 0;
    padding: 0;
  }
  img.full-width {
    width: 70%;
    display: block;
    margin: 0 auto 20px auto; 
  }