body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background: #f4f4f4;
  color: #333;
}

header, footer {
  background: #333;
  color: #fff;
  padding: 20px;
  text-align: center;
}

main {
  padding: 20px;
  max-width: 900px;
  margin: auto;
  background: white;
}

h1, h2 {
  color: #444;
}

ul {
  padding-left: 20px;
}

pre {
  background: #eee;
  padding: 10px;
  overflow-x: auto;
}

code {
  font-family: monospace;
  font-size: 0.9em;
}

a {
  color: #4a90e2;
  text-decoration: none;
}