@media (prefers-color-scheme: dark) {
  body {
    background-color: #333;
    color: #fff;
    zoom: 2;
  }
}

body {
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  padding: 0;
  zoom: 2;
}

div {
  display: flex;
  justify-content: center;
}

button {
  font-size: 1.5em;
  padding: 0.5em 1em;
  margin: 0.5em;
}