body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    background: #0b1220;
    color: #fff;
  }
  
  header {
    text-align: center;
    padding: 2rem;
    background: #1f7eff;
  }
  
  main {
    max-width: 800px;
    margin: auto;
    padding: 2rem;
  }
   
  footer {
    text-align: center;
    padding: 1rem;
    font-size: 0.9em;
    color: #aaa;
  }