body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f7f7f7;
  color: #333;
  line-height: 1.6;
}
header {
  background: #222;
  color: white;
  padding: 20px;
  text-align: center;
}
nav ul {
  list-style: none;
  padding: 0;
  margin: 10px 0 0;
  display: flex;
  justify-content: center;
  gap: 20px;
}
nav ul li a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}
nav ul li a:hover {
  text-decoration: underline;
}
main {
  padding: 30px;
  max-width: 800px;
  margin: auto;
}
footer {
  background: #eaeaea;
  text-align: center;
  padding: 15px;
  font-size: 0.9em;
}