body {
  font-family: Arial, sans-serif;
  background: #f1f1f1;
  margin: 0;
  padding: 20px;
}
.container {
  max-width: 600px;
  margin: auto;
}
.card {
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
h2, h3 {
  margin-top: 0;
}
.btn {
  display: inline-block;
  margin-top: 10px;
  padding: 10px 20px;
  background: #007bff;
  color: white;
  text-decoration: none;
  border-radius: 8px;
}
.form-check {
  margin: 10px 0;
}