body {
  font-family: sans-serif;
  text-align: center;
  padding: 2rem;
}
input {
  padding: 0.5rem;
  width: 60%;
}
button {
  padding: 0.5rem 1rem;
  margin-left: 1rem;
}
#output {
  margin-top: 2rem;
  font-size: 1.2rem;
}