body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background: #f9f9f9;
  color: #333;
}

header, footer {
  background: #00558b;
  color: #fff;
  padding: 1rem;
  text-align: center;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 1rem;
  background: #fff;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
}

section {
  margin-bottom: 2rem;
}

h2, h3 {
  color: #00558b;
}

@media (max-width: 600px) {
  main {
    margin: 1rem;
    padding: 1rem;
  }
}