body {
  background: #fffbe6;
  color: #5c3b00;
  font-family: sans-serif;
  text-align: center;
  padding: 2em;
}
body.dark {
  background: #111;
  color: #ffe;
}
button {
  padding: 1em;
  margin: 0.5em;
  font-size: 1em;
}