body {
  background: #fff;
  color: #222;
  font-family: monospace;
  padding: 1rem;
}

header {
  border-bottom: 1px solid #ccc;
  margin-bottom: 1rem;
}

#cli {
  margin-top: 1rem;
}

#output {
  white-space: pre-line;
  margin-bottom: 1rem;
}

input[type="text"] {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid #aaa;
  background: #f9f9f9;
  font-family: monospace;
}