body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  margin: 0;
  padding: 0;
}

header {
  background-color: #003f2f;
  color: white;
  padding: 1rem;
  text-align: center;
}

nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
  padding: 0;
  margin-top: 1rem;
  gap: 2rem;
}

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

main {
  padding: 2rem;
  background: white;
  margin: 2rem auto;
  max-width: 900px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

h2, h3 {
  color: #003f2f;
}

footer {
  background-color: #003f2f;
  color: white;
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
}