body {
  font-family: Arial, sans-serif;
  background: #111;
  color: #fff;
  text-align: center;
  padding: 40px;
}

.container {
  background: #1e1e1e;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 0 15px rgba(0,0,0,0.6);
}

button {
  display: block;
  width: 100%;
  padding: 12px;
  margin-top: 15px;
  border: none;
  border-radius: 8px;
  background: #4caf50;
  color: #fff;
  font-size: 16px;
  cursor: pointer;
}

button:hover {
  background: #45a049;
}