body {
  font-family: Arial, sans-serif;
  background: #f4f4f4;
}

.container {
  width: 320px;
  margin: 50px auto;
  padding: 20px;
  background: white;
  border-radius: 8px;
}

.field {
  margin-bottom: 15px;
}

button {
  width: 100%;
  padding: 10px;
}

.message {
  margin-top: 10px;
  font-weight: bold;
  font-size: 16px;
}

.success { color: green; }
.warning { color: orange; }
.error { color: red; }