body {
    background-color: #0d1117;
    color: #c9d1d9;
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
    text-align: center;
  }
  
  header {
    background-color: #161b22;
    padding: 2rem;
    border-bottom: 1px solid #30363d;
  }
  
  h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
  }
  
  h2 {
    font-size: 1.3rem;
    font-weight: 400;
    color: #8b949e;
  }
  
  main {
    padding: 3rem 1rem;
  }
  
  footer {
    padding: 1rem;
    font-size: 0.9rem;
    color: #6e7681;
  }