body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background-color: #fff;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  text-align: center;
}

h1 {
  margin-bottom: 20px;
}

.question {
  margin-bottom: 15px;
}

input {
  padding: 8px;
  width: 100%;
  max-width: 200px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

button {
  padding: 10px 20px;
  background-color: #28a745;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

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

.hidden {
  display: none;
}

#qrcode-container {
  margin-top: 20px;
}

#qrcode-container img {
  width: 150px;
  height: 150px;
}