body {
  font-family: Arial, sans-serif;
  padding: 2rem;
  background-color: #f5f7fa;
}
h1 {
  color: #004080;
}
nav button {
  margin-right: 1rem;
  padding: 0.5rem 1rem;
  font-size: 1rem;
}
section {
  margin-top: 2rem;
}