body {
    font-family: Arial, sans-serif;
  }
  
  header {
    background-color: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
  }
  
  header h1 {
    margin: 0;
  }
  
  header nav {
    display: flex;
    justify-content: center;
  }
  
  header nav a {
    color: #fff;
    display: block;
    padding: 10px 20px;
    text-decoration: none;
  }
  
  #hero h2 {
    margin: 0;
  }
  
  #hero .btn {
    background-color: #fff;
    border: none;
    color: #333;
    padding: 10px 20px;
    text-decoration: none;
  }
  
  #teachers {
    background-color: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
  }
  
  #teachers .teacher {
    display: inline-block;
    width: 33%;
    text-align: center;
    margin: 20px;
  }
  
  #teachers .teacher img {
 width: 100px;
  }
  
  #teachers .teacher h3 {
    margin: 10px 0;
  }
  
  footer {
    background-color: #444;
    color: #fff;
    padding: 20px;
    text-align: center;
  }
  body {
    background-color: #222222;
    color: #fff;
    font-family: Arial, sans-serif;
  }
  
  header {
    background-color: #333333;
    padding: 20px;
    text-align: center;
  }
  
  header {
    color: #fff;
    margin: 0;
  }
  h1 {
    margin: 0;
    size: 100px;
  }
  
  header nav {
    display: flex;
    justify-content: center;
  }
  
  header nav a {
    color: #fff;
    display: block;
    padding: 10px 20px;
    text-decoration: none;
  }
  
  #hero {
    background-image: url(hero-bg.jpg);
    background-size: cover;
    height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    text-align: center;
  }
  
  #hero h2 {
    font-size: 36px;
    margin-bottom: 20px;
  }
  
  #hero p {
    font-size: 18px;
    margin-bottom: 40px;
  }
  
  .btn {
    background-color: #444;
    border: 1px solid #fff;
    border-radius: 5px;
    color: #fff;
    display: inline-block;
    padding: 10px 20px;
    text-decoration: none;
  }
  
  section {
    padding: 80px 0;
    text-align: center;
  }
  
  section h2 {
    font-size: 36px;
    margin-bottom: 20px;
  }
  
  section p {
    font-size: 18px;
    margin-bottom: 40px;
  }
  
  footer {
    background-color: #333333;
    color: #fff;
    padding: 20px;
    text-align: center;
  }
 #xx{
    text-align: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 250px;
 }
 #xxx{
    margin-left: 45%;
 }
#nd{
    font-size: 400%;
}