body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f6f6f6;
  color: #222;
}
header {
  background: #0d6efd;
  color: white;
  padding: 40px 20px;
  text-align: center;
}
.content {
  padding: 20px;
  max-width: 900px;
  margin: auto;
  background: white;
  border-radius: 8px;
  margin-top: -20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
h2 { margin-top: 30px; }
h3 { margin-top: 20px; }
footer {
  text-align: center;
  padding: 20px;
  color: #777;
}