* {
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #bdbbbb;
    color: hsl(0, 1%, 29%);
  }
  
  header {
    background-color: #7cbaf8;
    padding: 15px 0;
  }
  
  nav ul {
    list-style: none;
    display: flex;
    justify-content: left;
    margin: 0;
    padding: 0;
  }
  
  nav ul li {
    margin: 0 15px;
  }
  
  nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    text-transform: uppercase;
  }
  
  nav ul li a:hover {
    color: #9a9aa0;
  }
  
  main {
    padding: 20px;
    max-width: 900px;
    margin: 20px auto;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  }
  
  main h1 {
    text-align: center;
    font-size: 30px;
    color: #5dabfe;
    margin-bottom: 20px;
  }
  
  main h2 {
    color: #333;
    border-top: 1px solid #5dabfe;
    border-bottom: 2px solid #5dabfe;
    padding-bottom: 10px;
    margin-top: 30px;
    margin-bottom: 20px;
  }
  
  main p {
    margin: 15px 0;
    text-align: justify;
  }
  
  footer {
    text-align: center;
    padding: 20px;
    background-color: #9ea0a1;
    color: #fff;
    margin-top: 20px;
  }
  
  footer a {
    color: #0056b3;
    text-decoration: none;
    margin: 0 15px;
  }
  
  footer a:hover {
    text-decoration: underline;
  }
  
  /* Responsive Design */
  @media (max-width: 768px) {
    nav ul {
      flex-direction: column;
      align-items: center;
    }
  
    nav ul li {
      margin: 10px 0;
    }
  
    main {
      padding: 10px;
      margin: 10px auto;
    }
  }