body {
  background-color: #E6F2FF;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

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

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

nav li {
  margin: 0 1rem;
}

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

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

section {
  margin-bottom: 2rem;
  background-color: white;
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h1, h2, h3 {
  color: #2E7D32;
}

footer {
  text-align: center;
  padding: 1rem;
  background-color: #4CAF50;
  color: white;
}

@media (max-width: 600px) {
  nav ul {
    flex-direction: column;
    align-items: center;
  }
  
  nav li {
    margin: 0.5rem 0;
  }
}