body {
  font-family: sans-serif;
  background: #f5f5f5;
}

.container {
  max-width: 800px;
  margin: 40px auto;
  padding: 20px 30px;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.08);
}

fieldset {
  margin-top: 15px;
  border: 1px solid #ddd;
  padding: 10px;
}

legend {
  font-weight: bold;
}

button {
  padding: 8px 16px;
  font-size: 1rem;
}

.message {
  margin-bottom: 10px;
  padding: 8px;
  border-radius: 4px;
  background: #e0f0ff;
}

.message.error {
  background: #ffd0d0;
}