body {
  font-family: sans-serif;
  padding: 2em;
  background: #f2f2f2;
  color: #333;
}
button {
  font-size: 1.2em;
  padding: 1em;
  margin: 0.5em;
}
#result {
  font-weight: bold;
  margin-top: 1em;
}
.visually-hidden {
  position: absolute;
  left: -9999px;
}