body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
  }
  
  header {
    background-color: #333;
    color: white;
    padding: 20px;
  }
  
  nav ul {
    list-style-type: none;
    padding: 0;
  }
  
  nav ul li {
    display: inline;
    margin-right: 10px;
  }
  
  nav a {
    color: white;
    text-decoration: none;
  }
  
  #banner {
    background-image: url('banner.jpg');
    background-size: cover;
    padding: 100px;
    text-align: center;
    color: white;
  }
  
  .cta-button {
    display: inline-block;
    background-color: #333;
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    margin-top: 20px;
  }
  
  #about {
    background-color: #f9f9f9;
    padding: 50px;
  }
  
  #courses {
    padding: 50px;
  }
  
  footer {
    background-color: #333;
    color: white;
    padding: 20px;
    text-align: center;
  }