body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f8f9fa;
  color: #222;
}
header {
  background: #0a4275;
  color: white;
  text-align: center;
  padding: 20px 0;
}
main {
  max-width: 900px;
  margin: 20px auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h1, h2, h3 {
  color: #0a4275;
}
ul {
  line-height: 1.8;
}
footer {
  text-align: center;
  background: #0a4275;
  color: white;
  padding: 10px 0;
  margin-top: 30px;
}