#payment {
  max-width: 30rem;
  margin: 10rem auto;
}

p.secondary {
  font-size: 0.8rem;
  color: #666;
}

img.qr {
  width: 100%;
  height: auto;
}

textarea.invoice {
  width: 100%;
  height: 6rem;
  font-family: monospace;
  font-size: 0.8rem;
}