body {
  font-family: Arial, sans-serif;
  background: linear-gradient(to bottom right, #d32f2f, #388e3c);
  color: white;
  text-align: center;
  padding: 20px;
}

h1 {
  font-size: 2.5rem;
}

.qr-code {
  margin: 20px auto;
  width: 200px;
}

.btc-balance {
  font-size: 1.5rem;
  margin: 20px;
  color: #ffeb3b;
}

#comments {
  background: rgba(255, 255, 255, 0.1);
  padding: 20px;
  border-radius: 10px;
}