body {
  font-family: sans-serif;
  background: #f4f4f4;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: #fff;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 0 12px rgba(0,0,0,0.1);
  width: 320px;
  text-align: center;
}

input, button {
  width: 100%;
  padding: 10px;
  margin-top: 10px;
  border-radius: 5px;
  border: 1px solid #ccc;
}

button {
  background-color: #4CAF50;
  color: white;
  border: none;
}

button:hover {
  background-color: #45a049;
}

#message {
  margin-top: 1rem;
  font-weight: bold;
}