body {
  font-family: Arial, sans-serif;
  background-color: #f8f9fa;
  margin: 0;
  padding: 20px;
}
h1, h2 {
  text-align: center;
}
.card {
  background: white;
  border-radius: 16px;
  padding: 20px;
  margin: 10px auto;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  max-width: 700px;
}
button {
  padding: 10px 20px;
  margin-top: 10px;
  font-size: 16px;
}
.checkbox {
  margin-right: 10px;
}