body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  margin: 0;
  padding: 0;
}
header {
  background: #2d2d2d;
  color: white;
  padding: 20px;
  text-align: center;
}
section {
  padding: 20px;
  background: white;
  margin: 20px auto;
  max-width: 800px;
  border-radius: 8px;
}
footer {
  background: #2d2d2d;
  color: white;
  text-align: center;
  padding: 10px;
}