body {
  font-family: sans-serif;
  margin: 2em;
  background: #f9f9f9;
}
.mxl-tool input {
  margin-bottom: 1em;
}
pre {
  background: #eee;
  padding: 1em;
  border-radius: 6px;
  overflow-y: auto;
  white-space: pre-wrap;
  min-height: 200px;
  max-height: 400px;
}