body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
  color: #333;
}
header {
  background: #222;
  color: #fff;
  text-align: center;
  padding: 40px;
}
section {
  padding: 20px;
  max-width: 800px;
  margin: auto;
}
footer {
  text-align: center;
  padding: 20px;
  background: #222;
  color: white;
  margin-top: 40px;
}
a { color: #00bcd4; text-decoration: none; }