body {
  font-family: sans-serif;
  padding: 1em;
  background: #f8f8f8;
}
h1 {
  font-size: 1.5em;
}
form {
  background: #fff;
  padding: 1em;
  border-radius: 10px;
  max-width: 400px;
}
input, select {
  width: 100%;
  margin-bottom: 10px;
  padding: 0.5em;
}
#qrcode {
  margin-top: 1em;
}