#test-output{
  font-family: monospace;
  border: 2px solid black;
  font-size: 16px;
  padding: 4px;
}
body{
  font-family: sans-serif;
}

button{
  border: none;
  background: #000;
  color: #fff;
  padding: 6px 12px;
  font-size: 18px;
}