body {
    font-family: 'Tahoma', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #1a1a1a;
    color: #000000;
  }
  
  header {
    background-color: #55a6e0;
    color: #ffffff;
    text-align: center;
    padding: 1rem 0;
  }
  
  main {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: #ffffff;
    border: 1px solid #000000;
    border-radius: 4px;
  }
  
  h1, h2 {
    color: #005a9c;
  }
  
  ul {
    list-style-type: square;
    padding: 0;
  }
  
  a {
    color: #0000ff;
    text-decoration: none;
    transition: color 0.3s;
  }
  
  a:hover {
    color: #ff0000;
  }
  
  footer {
    background-color: #55a6e0;
    color: #ffffff;
    text-align: center;
    padding: 5px 0;
    position: fixed;
    bottom: 0;
    width: 100%;
  }