body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: #f0f0f0;
  color: #333;
}

nav {
  background-color: #007bff;
  color: white;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

nav a.active {
  border-bottom: 2px solid white;
}

main {
  padding: 2rem;
  background: white;
  margin: 2rem;
  border-radius: 10px;
}