#preview {
  margin-top: 20px;
  max-width: 300px;
  border: 1px solid #ccc;
}
.result {
  margin-top: 20px;
  white-space: pre-wrap;
  border: 1px solid #eee;
  padding: 10px;
  max-width: 300px;
}
button {
  margin: 5px 0;
}