body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
}

header {
  background-color: #4CAF50;
  color: white;
  padding: 1rem;
}

main {
  padding: 1rem;
}

section {
  margin: 1rem 0;
}

h2 {
  color: #4CAF50;
}