body {
  font-family: Arial, sans-serif;
  background-color: #f0f0f0;
}

header {
  background-color: #3366cc;
  padding: 1rem;
  text-align: center;
  color: white;
}

nav ul {
  list-style-type: none;
  padding: 0;
  display: flex;
  justify-content: center;
  gap: 1rem;
}

nav a {
  text-decoration: none;
  color: #3366cc;
}

main section {
  background-color: white;
  padding: 2rem;
  margin: 2rem auto;
  width: 80%;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}