body {
  font-family: Arial, sans-serif;
  text-align: center;
  padding: 50px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.light-mode {
  background-color: #ffffff;
  color: #000000;
}

.dark-mode {
  background-color: #333333;
  color: #ffffff;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  margin-top: 20px;
  cursor: pointer;
  border: none;
  border-radius: 5px;
  background-color: #007bff;
  color: white;
}