body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
  color: #333;
}

header {
  background-color: #007bff;
  color: white;
  text-align: center;
  padding: 1rem;
}

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

.product {
  background: white;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.product h3 {
  margin-top: 0;
}

.product p {
  margin: 0.5rem 0;
}

button {
  background-color: #28a745;
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
}

button:hover {
  background-color: #218838;
}

#qr-container {
  text-align: center;
  margin: 10px 0;
}