body {
  background-color: #fffef3;
  font-family: "Microsoft JhengHei", sans-serif;
  margin: 0;
  padding: 0;
}

h1, h2, h3 {
  color: #333;
}

button {
  transition: background-color 0.3s ease;
}

button:hover {
  opacity: 0.9;
}