body {
  font-family: Arial, sans-serif;
  padding: 20px;
  background-color: #f2f2f2;
}

.container {
  background: #fff;
  padding: 30px;
  border-radius: 10px;
  max-width: 600px;
  margin: auto;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

input[type="text"] {
  padding: 10px;
  width: 100%;
  margin-bottom: 10px;
  font-size: 16px;
}

button {
  padding: 10px 20px;
  background: green;
  color: white;
  border: none;
  cursor: pointer;
  font-size: 16px;
}

.message {
  margin-top: 10px;
  font-weight: bold;
  color: red;
}