body {
  font-family: Arial, sans-serif;
  text-align: center;
  padding: 20px;
  background-color: white;
  transition: background-color 0.5s, color 0.5s;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
  margin: 10px;
}

.dark-mode {
  background-color: #222;
  color: white;
}