body {
  font-family: sans-serif;
  margin: 2em;
}
textarea {
  width: 100%;
  height: 100px;
}
pre {
  background-color: #f4f4f4;
  padding: 1em;
  margin-top: 1em;
  white-space: pre-wrap;
}
button {
  margin-right: 1em;
}